Silicates—including quartz, mica, olivine ... Emeralds are formed of a mineral called beryl whose chemical formula is a complex mix of beryllium, aluminum, silicon, and oxygen.
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What's the difference between a rock and a mineral?Quartz is made of the chemical elements silicon and oxygen and has the chemical formula (SiO2). The mineral is colorless in its pure form, but impurities can either make quartz crystals appear ...
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