| Speaking as a professional geologist, and a doctor of igneous petrology at that, I can say positively that Quartz is NOT the most common mineral, either in the Earth's crust, and even less-so in the bulk earth...it's not even in the top ten list there. The most common mineral, by far, is plagioclase, one of the feldspars. So far as being a prominent component therein, quartz is almost exclusively found in granite, high-silica granitoids, rhyolite, sandstone, and some metamorphic rocks. The most common rock on the earth's surface gabbro/basalt contains NO quartz, except in extremely rare cases. Plagioclase, meanwhile, runs the gamut of all igneous rocks, often overwhelmingly abundant in both plutonic and volcanic, and is common in many sandstones and metamorphic rocks, too. To say quartz is the most common is, sadly, a misconception from high-school and before that petrologists like myself have been trying for decades to correct. |
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