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Gemstones, Minerals & Fossils
Gemstones and Minerals
barrington tops geodes
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<blockquote data-quote="shivan" data-source="post: 231756" data-attributes="member: 194"><p>Lots of different ways to look at it I guess, I just like talking about rocks <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> . </p><p>Rhyolite is the felsic equivalent of basalt, so they both get extruded (lava flows) and cool very quickly, this means that the crystals do not have time to grow and the crystals in the groundmass can really only be seen under a microscope.</p><p>But chemically granite is similar to rhyolite and gabbro similar to basalt, but granite and gabbro are intrusive, so it forms underground where it cools more slowly and the crystals have time to grow big enough to be seen with the naked eye.</p><p></p><p>What blisters said was right on the mark. One of rhyolites main minerals is quartz which you will not find in a basalt (unless in a pocket that has been deposited after the basalt). Where as basalt has olivine, which you will not find in a rhyolite.</p></blockquote><p></p>
[QUOTE="shivan, post: 231756, member: 194"] Lots of different ways to look at it I guess, I just like talking about rocks ;) . Rhyolite is the felsic equivalent of basalt, so they both get extruded (lava flows) and cool very quickly, this means that the crystals do not have time to grow and the crystals in the groundmass can really only be seen under a microscope. But chemically granite is similar to rhyolite and gabbro similar to basalt, but granite and gabbro are intrusive, so it forms underground where it cools more slowly and the crystals have time to grow big enough to be seen with the naked eye. What blisters said was right on the mark. One of rhyolites main minerals is quartz which you will not find in a basalt (unless in a pocket that has been deposited after the basalt). Where as basalt has olivine, which you will not find in a rhyolite. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
barrington tops geodes
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