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Mineral
Identification by Picture and Attribute
Explorers! Before you begin your journey, you need to recognize these geological specimens. |
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Begin by selecting one of the specimens pictured. |
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Inosilicates, Neosilicates, Sorosilicates |
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Oxides, Hydroxides, Carbonates |
Silicates |
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Name: Biotite |
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Class: SILICATES Subclass: Phylosilicates (sheet silicates) |
Color
black - brown |
Chemical Formula: K(Mg, Fe+2)3(Al, Fe+3) Si3O10(OH, F)2 |
Streak
gray - brown |
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Luster
glassy |
Hardness
2.5 - 3 |
Cleavage
1 direction, perfect |
Density
2.8 - 3.4 |
Crystal Form
Monoclinic |
Common Uses / Other Facts: |
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Sulfides and Sulfates |
Halides |
Organic |
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