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Annite

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PDM813130

Annite

Description Tabs

Description
Locality: 
Tvedalen, Larvik, Vestfold og Telemark, Norway
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 6.8 × 5.6 cm
Description

Black tabular hexagonal crystals of “biotite” with some minor quartz from an undisclosed deposit in Tvedalen.

Collected in 1975-77 by Jan Sibtsen.

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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