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Annite

#19645
SOLD
Annite from Bigwood Township, Sudbury, Ontario, Canada - 19645
Annite from Bigwood Township, Sudbury, Ontario, Canada - 19645

Annite

#19645
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 
Formula
KFe2+3(Si3Al)O10(OH)2 (RRUFF)
Locality
Bigwood Township, Sudbury, Ontario, Canada

Dark black cleavable plates to 2cm.

Annite is the iron rich, OH end member, of the Biotite- Phlogopite series. Common in schists, worldwide, occuring up to 3meters (!!) as crystals in granites of Cape Ann near Rockport, Mass. USA, and crystals up to 15cm from MSH (Bernard & Hrysl). Sometimes forming pseudohexagonal outlines, and foliated masses, in Mg poor igneous and metamorphc rocks.

Phyllosilicate Mica group member. Ordinary (True or Common) Mica - Trioctahderal. 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.

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