Mineral Name

Biotite

Chemical Formula

KAl2(AlSi3O10)(OH)2

Creator

Preview

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Color

dark brown, greenish-brown, blackish-brown, yellow, white

Class

Article

Luster

vitreous - pearly

Diaphaneity

transparent to translucent to opaque

Hardness

2.5-3

Cleavage

1 direction: {001} perfect

Fracture

uneven, flat surfaces

Density

2.8-3.4

Crystal Shape

rarely in tabular or short prismatic crystals with prominent {001} and pseudohexagonal outline.

Crystal System

Monoclinic

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