K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2
Color: brown to black
Hardness: 2.5-3
Streak: gray brown
Cleavage: basal
Luster: non-metallic
Other Properties: soluble in sulfuric acid
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Biotite
K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2 Color: brown to black Hardness: 2.5-3 Streak: gray brown Cleavage: basal Luster: non-metallic Other Properties: soluble in sulfuric acid |
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