silicate ⪢⪢
-- crust, silicon, feldspar, quartz, potassium, plasioclase
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 Introduction to Minerals
○ 5 citeria: solid, naturally occurring, inorganic, fixed chemical formula, specific atomic arrangement -- igneous, granite, speckle, quartz, biotite mica, plagioclase feldspar, fluorite, talc, selenite gypsum, pyrite, silicate, bituminous, sulfur, halite
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