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Annite

#PD34677

Annite

#PD34677
Availability
Sold
Size
3.5 x 2.5 x 0.6 cm - Miniature 
Formula
KFe2+3(Si3Al)O10(OH)2 (RRUFF)
Locality
Mont Saint-Hilaire, Rouville Co., Quebec, Canada

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

This specimen is only a small dark cleavage plate.

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
Phillips Collection
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