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		<title>Geological Magazine. 103 2 : 110-114. Bibcode:1966GeoM..103..110S - Versionsgeschichte</title>
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		<updated>2026-04-21T23:57:35Z</updated>
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		<id>http://www.vokipedia.de/index.php?title=Geological_Magazine._103_2_:_110-114._Bibcode:1966GeoM..103..110S&amp;diff=228082&amp;oldid=prev</id>
		<title>BCTFlorentina am 15. November 2025 um 22:23 Uhr</title>
		<link rel="alternate" type="text/html" href="http://www.vokipedia.de/index.php?title=Geological_Magazine._103_2_:_110-114._Bibcode:1966GeoM..103..110S&amp;diff=228082&amp;oldid=prev"/>
				<updated>2025-11-15T22:23:16Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class='diff diff-contentalign-left'&gt;
				&lt;col class='diff-marker' /&gt;
				&lt;col class='diff-content' /&gt;
				&lt;col class='diff-marker' /&gt;
				&lt;col class='diff-content' /&gt;
			&lt;tr valign='top'&gt;
			&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Nächstältere Version&lt;/td&gt;
			&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Version vom 15. November 2025, 22:23 Uhr&lt;/td&gt;
			&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Zeile 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Zeile 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;[https://soul-etches.blogspot.com/2023/08/croissant.html blogspot.com]&lt;/del&gt;&amp;lt;br&amp;gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. 80% of the surface, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt; [http://maxes.co.kr/bbs/board.php?bo_table=free&amp;amp;wr_id=2123562 Try Derila Today] &lt;/del&gt;are basaltic; the lunar maria are plains of &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;[https://www.healthynewage.com/?s=flood-basaltic%20lava &lt;/del&gt;flood-basaltic lava&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;] &lt;/del&gt;flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations. Basaltic magmas within Earth are thought to originate from the upper mantle. The chemistry of basalts thus provides clues to processes deep in Earth's interior.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;Basalt is composed mostly of oxides of silicon, iron, magnesium, potassium, aluminum, titanium, and calcium. Geologists classify igneous rock by its mineral content whenever possible; the relative volume percentages of quartz (crystalline silica (SiO2)), alkali feldspar, plagioclase, and feldspathoid (QAPF) are particularly important. An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. It is often not practical to determine the mineral composition of volcanic rocks, due to their very small grain size, in which case geologists instead classify the rocks chemically, with particular emphasis on the total content of alkali metal oxides and silica (TAS); in that context, basalt is defined as volcanic rock with a content of between 45% and 52% silica and no more than 5% alkali metal oxides.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;This places basalt in the B field of the TAS diagram. Such a composition is described as mafic. Some basalts are quite light-coloured due to a high content of plagioclase; these are sometimes described as leucobasalts. It can be difficult to distinguish between lighter-colored basalt and andesite, so field researchers commonly use a rule of thumb for this purpose, classifying it as basalt if it has a color index of 35 or greater. The physical properties of basalt result from its relatively low silica content and typically high iron and magnesium content. The average density of basalt is 2.9 g/cm3, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt; [http://carecall.co.kr/bbs/board.php?bo_table=free&amp;amp;wr_id=1475447 Derila™ Memory Pillow] &lt;/del&gt;compared, for example, to granite’s typical density of 2.7 g/cm3. Basalt often contains vesicles; they are formed when dissolved gases bubble out of the magma as it decompresses during its approach to the surface; the erupted lava then solidifies before the gases can escape. When vesicles make up a substantial fraction of the volume of the rock, the rock is described as scoria.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;The term basalt is at times applied to shallow intrusive rocks with a composition typical of basalt, but rocks of this composition with a phaneritic (coarser) groundmass are more properly referred to either as diabase (also called dolerite) or-when they are more coarse-grained (having crystals over 2 mm across)-as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt. During the Hadean, Archean, and early Proterozoic eons of Earth's history, the chemistry of erupted magmas was significantly different from what it is [https://&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;git&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;bpcspace&lt;/del&gt;.com/&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;salliecrotty57 Try Derila Today], due to immature crustal and &lt;/del&gt;asthenosphere differentiation. The resulting ultramafic volcanic rocks, with silica (SiO2) contents below 45% and high magnesium oxide (MgO) content, are usually classified as komatiites. The word &amp;quot;basalt&amp;quot; is ultimately derived from Late Latin basaltes, a misspelling of Latin basanites &amp;quot;very hard stone&amp;quot;, which was imported from Ancient Greek βασανίτης (basanites), from βάσανος (basanos, &amp;quot;touchstone&amp;quot;). The modern petrological term basalt, describing a particular composition of lava-derived rock, became standard because of its use by Georgius Agricola in 1546, in his work De Natura Fossilium.&amp;lt;br&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&amp;lt;br&amp;gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. 80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations. Basaltic magmas within Earth are thought to originate from the upper mantle. The chemistry of basalts thus provides clues to processes deep in Earth's interior.&amp;lt;br&amp;gt; &amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;Basalt is composed mostly of oxides of silicon, iron, magnesium, potassium, aluminum, titanium, and calcium. Geologists classify igneous rock by its mineral content whenever possible; the relative volume percentages of quartz (crystalline silica (SiO2)), alkali feldspar, plagioclase, and feldspathoid (QAPF) are particularly important. An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. It is often not practical to determine the mineral composition of volcanic rocks, due to their very small grain size, in which case geologists instead classify the rocks chemically, with particular emphasis on the total content of alkali metal oxides and silica (TAS); in that context, basalt is defined as volcanic rock with a content of between 45% and &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt; Ergonomic Neck Pillow &lt;/ins&gt;52% silica and no more than 5% alkali metal oxides.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;This places basalt in the B field of the TAS diagram. Such a composition is described as mafic. Some basalts are quite light-coloured due to a high content of plagioclase; these are sometimes described as leucobasalts. It can be difficult to distinguish between lighter-colored basalt and andesite, so field researchers commonly use a rule of thumb for this purpose, classifying it as basalt if it has a color index of 35 or greater. The physical properties of basalt result from its relatively low silica content and typically high iron and &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt; Experience Derila Support &lt;/ins&gt;magnesium content. The average density of basalt is 2.9 g/cm3, compared, for example, to granite’s typical density of 2.7 g/cm3. Basalt often contains vesicles; they are formed when dissolved gases bubble out of the magma as it decompresses during its approach to the surface; the erupted lava then solidifies before the gases can escape. When vesicles make up a substantial fraction of the volume of the rock, the rock is described as scoria.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;The term basalt is at times applied to shallow intrusive rocks with a composition typical of basalt, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt; [https://rentry.co/90980-everything-you-need-to-know-about-derila-pillow Derila Sleep Support] &lt;/ins&gt;but rocks of this composition with a phaneritic (coarser) groundmass are more properly referred to either as diabase (also called dolerite) or-when they are more coarse-grained (having crystals over 2 mm across)-as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt. During the Hadean, Archean, and early Proterozoic eons of Earth's history, the chemistry of erupted magmas was significantly different from what it is &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;today, due to immature crustal and &lt;/ins&gt;[https://&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;www&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;tumblr&lt;/ins&gt;.com/&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;search/asthenosphere%20differentiation &lt;/ins&gt;asthenosphere differentiation&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;]&lt;/ins&gt;. The resulting ultramafic volcanic rocks, with silica (SiO2) contents below 45% and high magnesium oxide (MgO) content, are usually classified as komatiites. The word &amp;quot;basalt&amp;quot; is ultimately derived from Late Latin basaltes, a misspelling of Latin basanites &amp;quot;very hard stone&amp;quot;, which was imported from Ancient Greek βασανίτης (basanites), from βάσανος (basanos, &amp;quot;touchstone&amp;quot;). The modern petrological term basalt, describing a particular composition of lava-derived rock, became standard because of its use by Georgius Agricola in 1546, in his work De Natura Fossilium.&amp;lt;br&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>BCTFlorentina</name></author>	</entry>

	<entry>
		<id>http://www.vokipedia.de/index.php?title=Geological_Magazine._103_2_:_110-114._Bibcode:1966GeoM..103..110S&amp;diff=190259&amp;oldid=prev</id>
		<title>ChristySlack75 am 19. Oktober 2025 um 18:10 Uhr</title>
		<link rel="alternate" type="text/html" href="http://www.vokipedia.de/index.php?title=Geological_Magazine._103_2_:_110-114._Bibcode:1966GeoM..103..110S&amp;diff=190259&amp;oldid=prev"/>
				<updated>2025-10-19T18:10:56Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class='diff diff-contentalign-left'&gt;
				&lt;col class='diff-marker' /&gt;
				&lt;col class='diff-content' /&gt;
				&lt;col class='diff-marker' /&gt;
				&lt;col class='diff-content' /&gt;
			&lt;tr valign='top'&gt;
			&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Nächstältere Version&lt;/td&gt;
			&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Version vom 19. Oktober 2025, 18:10 Uhr&lt;/td&gt;
			&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Zeile 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Zeile 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&amp;lt;br&amp;gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. 80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations. Basaltic magmas within Earth are thought to originate from the upper mantle. The chemistry of basalts thus provides clues to processes deep in Earth's interior.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;Basalt is composed mostly of oxides of silicon, iron, magnesium, potassium, aluminum, titanium, and calcium. Geologists classify igneous rock by its mineral content whenever possible; the relative volume percentages of quartz (crystalline silica (SiO2)), alkali feldspar, plagioclase, and feldspathoid (QAPF) are particularly important. An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. It is often not practical to determine the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;[https://www.b2bmarketing.net/en-gb/search/site/mineral%20composition &lt;/del&gt;mineral composition&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;] &lt;/del&gt;of volcanic rocks, due to their very small grain size, in which case geologists instead classify the rocks chemically, with particular emphasis on the total content of alkali metal oxides and &lt;del class=&quot;diffchange diffchange-inline&quot;&gt; [https://santo.kr:443/bbs/board.php?bo_table=free&amp;amp;wr_id=279421 Derila Neck Relief Pillow] &lt;/del&gt;silica (TAS); in that context, basalt is defined as volcanic rock with a content of between 45% and 52% silica and no more than 5% alkali metal oxides.&amp;lt;br&amp;gt; &amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;This places basalt in the B field of the TAS diagram. Such a composition is described as mafic. Some basalts are quite light-coloured due to a high content of plagioclase; these are sometimes described as leucobasalts. It can be difficult to distinguish between lighter-colored basalt and andesite, so field researchers commonly use a rule of thumb for &lt;del class=&quot;diffchange diffchange-inline&quot;&gt; Comfortable Sleep Pillow &lt;/del&gt;this purpose, classifying it as basalt if it has a color &lt;del class=&quot;diffchange diffchange-inline&quot;&gt; [https://minecraft-builder.com/everything-you-need-to-know-about-derila-pillow-2/ Shop Derila Online] &lt;/del&gt;index of 35 or greater. The physical properties of basalt result from its relatively low silica content and typically high iron and magnesium content. The average density of basalt is 2.9 g/cm3,&amp;#160; [&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;https&lt;/del&gt;://&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;newdemo1st&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;rst7&lt;/del&gt;.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;rschooltoday.com&lt;/del&gt;/&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;reasons-to-educate-people-what-are-the-advantages-of-education&lt;/del&gt;/ &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Buy Derila Online&lt;/del&gt;] compared, for example, to granite’s typical density of 2.7 g/cm3. Basalt often contains vesicles; they are formed when dissolved gases bubble out of the magma as it decompresses during its approach to the surface; the erupted lava then solidifies before the gases can escape. When vesicles make up a substantial fraction of the volume of the rock, the rock is described as scoria.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;The term basalt is at times applied to shallow intrusive rocks with a composition typical of basalt, but rocks of this composition with a phaneritic (coarser) groundmass are more properly referred to either as diabase (also called dolerite) or-when they are more coarse-grained (having crystals over 2 mm across)-as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt. During the Hadean, Archean, and early Proterozoic eons of Earth's history, the chemistry of erupted magmas was significantly different from what it is &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;today&lt;/del&gt;, due to immature crustal and asthenosphere differentiation. The resulting ultramafic volcanic rocks, with silica (SiO2) contents below 45% and high magnesium oxide (MgO) content, are usually classified as komatiites. The word &amp;quot;basalt&amp;quot; is ultimately derived from Late Latin basaltes, a misspelling of Latin basanites &amp;quot;very hard stone&amp;quot;, which was imported from Ancient Greek βασανίτης (basanites), from βάσανος (basanos, &amp;quot;touchstone&amp;quot;). The modern petrological term basalt, describing a particular composition of lava-derived rock, became standard because of its use by Georgius Agricola in 1546, in his work De Natura Fossilium.&amp;lt;br&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[https://soul-etches.blogspot.com/2023/08/croissant.html blogspot.com]&lt;/ins&gt;&amp;lt;br&amp;gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. 80% of the surface, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt; [http://maxes.co.kr/bbs/board.php?bo_table=free&amp;amp;wr_id=2123562 Try Derila Today] &lt;/ins&gt;are basaltic; the lunar maria are plains of &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[https://www.healthynewage.com/?s=flood-basaltic%20lava &lt;/ins&gt;flood-basaltic lava&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;] &lt;/ins&gt;flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations. Basaltic magmas within Earth are thought to originate from the upper mantle. The chemistry of basalts thus provides clues to processes deep in Earth's interior.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;Basalt is composed mostly of oxides of silicon, iron, magnesium, potassium, aluminum, titanium, and calcium. Geologists classify igneous rock by its mineral content whenever possible; the relative volume percentages of quartz (crystalline silica (SiO2)), alkali feldspar, plagioclase, and feldspathoid (QAPF) are particularly important. An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. It is often not practical to determine the mineral composition of volcanic rocks, due to their very small grain size, in which case geologists instead classify the rocks chemically, with particular emphasis on the total content of alkali metal oxides and silica (TAS); in that context, basalt is defined as volcanic rock with a content of between 45% and 52% silica and no more than 5% alkali metal oxides.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;This places basalt in the B field of the TAS diagram. Such a composition is described as mafic. Some basalts are quite light-coloured due to a high content of plagioclase; these are sometimes described as leucobasalts. It can be difficult to distinguish between lighter-colored basalt and andesite, so field researchers commonly use a rule of thumb for this purpose, classifying it as basalt if it has a color index of 35 or greater. The physical properties of basalt result from its relatively low silica content and typically high iron and magnesium content. The average density of basalt is 2.9 g/cm3,&amp;#160; [&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;http&lt;/ins&gt;://&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;carecall&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;co&lt;/ins&gt;.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;kr&lt;/ins&gt;/&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;bbs&lt;/ins&gt;/&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;board.php?bo_table=free&amp;amp;wr_id=1475447 Derila™ Memory Pillow&lt;/ins&gt;] compared, for example, to granite’s typical density of 2.7 g/cm3. Basalt often contains vesicles; they are formed when dissolved gases bubble out of the magma as it decompresses during its approach to the surface; the erupted lava then solidifies before the gases can escape. When vesicles make up a substantial fraction of the volume of the rock, the rock is described as scoria.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;The term basalt is at times applied to shallow intrusive rocks with a composition typical of basalt, but rocks of this composition with a phaneritic (coarser) groundmass are more properly referred to either as diabase (also called dolerite) or-when they are more coarse-grained (having crystals over 2 mm across)-as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt. During the Hadean, Archean, and early Proterozoic eons of Earth's history, the chemistry of erupted magmas was significantly different from what it is &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[https://git.bpcspace.com/salliecrotty57 Try Derila Today]&lt;/ins&gt;, due to immature crustal and asthenosphere differentiation. The resulting ultramafic volcanic rocks, with silica (SiO2) contents below 45% and high magnesium oxide (MgO) content, are usually classified as komatiites. The word &amp;quot;basalt&amp;quot; is ultimately derived from Late Latin basaltes, a misspelling of Latin basanites &amp;quot;very hard stone&amp;quot;, which was imported from Ancient Greek βασανίτης (basanites), from βάσανος (basanos, &amp;quot;touchstone&amp;quot;). The modern petrological term basalt, describing a particular composition of lava-derived rock, became standard because of its use by Georgius Agricola in 1546, in his work De Natura Fossilium.&amp;lt;br&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>ChristySlack75</name></author>	</entry>

	<entry>
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		<title>AXBDieter2322214: Die Seite wurde neu angelegt: „&lt;br&gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling,…“</title>
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		<summary type="html">&lt;p&gt;Die Seite wurde neu angelegt: „&amp;lt;br&amp;gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling,…“&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Neue Seite&lt;/b&gt;&lt;/p&gt;&lt;div&gt;&amp;lt;br&amp;gt;More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt has the same chemical composition and mineralogy as slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. 80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flows that can spread over great areas before cooling and solidifying. Flood basalts are thick sequences of many such flows that can cover hundreds of thousands of square kilometres and constitute the most voluminous of all volcanic formations. Basaltic magmas within Earth are thought to originate from the upper mantle. The chemistry of basalts thus provides clues to processes deep in Earth's interior.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;Basalt is composed mostly of oxides of silicon, iron, magnesium, potassium, aluminum, titanium, and calcium. Geologists classify igneous rock by its mineral content whenever possible; the relative volume percentages of quartz (crystalline silica (SiO2)), alkali feldspar, plagioclase, and feldspathoid (QAPF) are particularly important. An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content. This places basalt in the basalt/andesite field of the QAPF diagram. It is often not practical to determine the [https://www.b2bmarketing.net/en-gb/search/site/mineral%20composition mineral composition] of volcanic rocks, due to their very small grain size, in which case geologists instead classify the rocks chemically, with particular emphasis on the total content of alkali metal oxides and  [https://santo.kr:443/bbs/board.php?bo_table=free&amp;amp;wr_id=279421 Derila Neck Relief Pillow] silica (TAS); in that context, basalt is defined as volcanic rock with a content of between 45% and 52% silica and no more than 5% alkali metal oxides.&amp;lt;br&amp;gt; &amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;This places basalt in the B field of the TAS diagram. Such a composition is described as mafic. Some basalts are quite light-coloured due to a high content of plagioclase; these are sometimes described as leucobasalts. It can be difficult to distinguish between lighter-colored basalt and andesite, so field researchers commonly use a rule of thumb for  Comfortable Sleep Pillow this purpose, classifying it as basalt if it has a color  [https://minecraft-builder.com/everything-you-need-to-know-about-derila-pillow-2/ Shop Derila Online] index of 35 or greater. The physical properties of basalt result from its relatively low silica content and typically high iron and magnesium content. The average density of basalt is 2.9 g/cm3,  [https://newdemo1st.rst7.rschooltoday.com/reasons-to-educate-people-what-are-the-advantages-of-education/ Buy Derila Online] compared, for example, to granite’s typical density of 2.7 g/cm3. Basalt often contains vesicles; they are formed when dissolved gases bubble out of the magma as it decompresses during its approach to the surface; the erupted lava then solidifies before the gases can escape. When vesicles make up a substantial fraction of the volume of the rock, the rock is described as scoria.&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;&amp;lt;br&amp;gt;The term basalt is at times applied to shallow intrusive rocks with a composition typical of basalt, but rocks of this composition with a phaneritic (coarser) groundmass are more properly referred to either as diabase (also called dolerite) or-when they are more coarse-grained (having crystals over 2 mm across)-as gabbro. Diabase and gabbro are thus the hypabyssal and plutonic equivalents of basalt. During the Hadean, Archean, and early Proterozoic eons of Earth's history, the chemistry of erupted magmas was significantly different from what it is today, due to immature crustal and asthenosphere differentiation. The resulting ultramafic volcanic rocks, with silica (SiO2) contents below 45% and high magnesium oxide (MgO) content, are usually classified as komatiites. The word &amp;quot;basalt&amp;quot; is ultimately derived from Late Latin basaltes, a misspelling of Latin basanites &amp;quot;very hard stone&amp;quot;, which was imported from Ancient Greek βασανίτης (basanites), from βάσανος (basanos, &amp;quot;touchstone&amp;quot;). The modern petrological term basalt, describing a particular composition of lava-derived rock, became standard because of its use by Georgius Agricola in 1546, in his work De Natura Fossilium.&amp;lt;br&amp;gt;&lt;/div&gt;</summary>
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