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Annite

#PD57608
Annite from Redruth, Cornwall, England - PD57608
Annite from Redruth, Cornwall, England - PD57608

Annite

#PD57608
Availability
Available
Price
$35.00
Size
7 x 5.5 x 3 cm - Sm Cabinet 
Formula
KFe2+3(Si3Al)O10(OH)2 (RRUFF)
Locality
Redruth, Cornwall, England

Bronzy black Annite flakes throughout mass.

Biotite has historically been treated as an individual mineral species by geologist. 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 and is classified as an ordinary (True or Common) mica meaning it has flexible cleavage plates. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

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
Don Phillips Collection
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