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
sulfur and oxygen with a metal, low hardness i.e Gypsums
Metal and Fluorine or Chlorine, low hardness, poor conductors i.e Halites and Fluorites
Single Elements, lots of variation i.e Gold, Silver, Iron, Sulfur, Diamond, Copper, Platinum, Graphite
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