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Annite - Phlogopite series

#45889
SOLD
Annite from Sheep Creek, Ravalli Co., Montana, United States - 45889
Annite from Sheep Creek, Ravalli Co., Montana, United States - 45889

Annite - Phlogopite series

#45889
Availability
Sold
Size
14 x 8 x 1 cm - Cabinet 
Formula
KFe2+3(Si3Al)O10(OH)2 (RRUFF)
Locality
Sheep Creek, Ravalli Co., Montana, United States

A large plate of black to golden black "biotite". Biotite is not a distinct species but falls within the Annite-Phlogopite series. 

Annite

Formula
KFe2+3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
reddish brown, black 
Streak
brownish white 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 

Data courtesy of Webmineral.

Collection
Chris van Laer Collection
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