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most common 90% made of oxygen and silicon, varying hardness, not dense. Garnet, Rose Quartz, Zircon, Amethyst, Muscovite, Quartz, Biotite, Tourmaline, Emerald, Topaz, Tale
Oxygen and a metal, they have a high density and a dark color. i.e, Limorite, Magnetite, Sapphire, Ruby, Hematite
Metal,Carbon,and Oxygen, low hardness, react in acid i.e Calcites, Dolomites, Malachites, Azurites
sulfur and a metal, distinctive streak, metallic luster, mid to low hardness, high density i.e Galena, Pyrite
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