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Annite

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QRI781830

Annite

Former collection Bonisoli (I)

Description Tabs

Description
Locality: 
Narraburra Granite, Bland County, New South Wales, Australia
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.2 × 6.1 × 0.3 cm
Weight: 
10.00gr
Description

Interesting package of textbook annite mica plates nicely stacked on top of each other. When backlit, an internal V shaped structure is visible due to a partial transparency of the very thin individual plates. The outer rim resembles a crude pseudohexagonal section.

I could not retrieve the locality reported on the label, hence my attribution to Narraburra due to reported geology.

From the legendary Bonisoli collection (I).

Mineral Data
What's on the rock

Annite

Formula: 
KFe2+3(AlSi3O10)(OH)2
Strunz: 
9.EC.20
Crystal System: 
Monoclinic
Hardness: 
3.0
Colour: 
Black
Type Locality: 
Rockport, Essex Co., Massachusetts, USA

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