Biotite
SOLD
Biotite
- Sold
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- Availability
- Sold
- Size
- 6 x 3 x 1 cm - Sm Cabinet
- Formula
- Unavailable
- Locality
- Broken Hill, New South Wales, Australia
A cleavable mass of dark black Biotite.
Biotite has historically been treated as an individual mineral species and also treated as a generic dark mica in the field for those geologist without the aid of a portable XRd. Rieder et. al in the Canadian Mineralogist v. 36 (1998), reclassified and placed Biotite within the Annite-Phlogopite series.
Biotite is a phyllosilicate of the Mica group. Ordinary (True or Common) Mica - with flexible cleavage plates. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.
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
Data courtesy of Webmineral.
- Collection
- Phillips Collection
- Mineralpedia
- View Biotite
- On Dakota Matrix
- Previously Sold Biotite
- On Dakota Matrix
- Other Available Biotite
- WebMineral
- View Biotite
- Mindat
- View Biotite
