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Sillicates

most common 90% made of oxygen and silicon, varying hardness, not dense. Garnet, Rose Quartz, Zircon, Amethyst, Muscovite, Quartz, Biotite, Tourmaline, Emerald, Topaz, Tale

Oxides

Oxygen and a metal, they have a high density and a dark color. i.e, Limorite, Magnetite, Sapphire, Ruby, Hematite

Carbonate

Metal,Carbon,and Oxygen, low hardness, react in acid i.e Calcites, Dolomites, Malachites, Azurites

Sulfides

sulfur and a metal, distinctive streak, metallic luster, mid to low hardness, high density i.e Galena, Pyrite

Sulfates

sulfur and oxygen with a metal, low hardness i.e Gypsums

Halides

Metal and Fluorine or Chlorine, low hardness, poor conductors i.e Halites and Fluorites

Native Elements

Single Elements, lots of variation i.e Gold, Silver, Iron, Sulfur, Diamond, Copper, Platinum, Graphite

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