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Biotite

#PD46685
SOLD
Biotite from Broken Hill, New South Wales, Australia - PD46685
Biotite from Broken Hill, New South Wales, Australia - PD46685

Biotite

#PD46685
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
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On Dakota Matrix
Previously Sold Biotite
On Dakota Matrix
Other Available Biotite
WebMineral
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Mindat
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