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Biotite

- Formula
- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Crystal System
- Monoclinic
- Crystal Habit
- Micaceous, Lamellar, Pseudo Hexagonal
- Cleavage
- Perfect, None, None
- Luster
- Vitreous - Pearly
- Color
- dark brown, greenish brown, blackish brown, yellow, white
- Streak
- gray
- Class
- Monoclinic - Prismatic
- Fracture
- Uneven
- Hardness
- 2.5-3
- WebMineral
- View Biotite
- Mindat
- View Biotite
Localities of Biotite
No localitiy information available.