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Armangite & Katoptrite

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SER897182

Armangite & Katoptrite

ex Americo Urbinati collection

Description Tabs

Description
Locality: 
Brattfors Mine, Nordmark, Filipstad, Värmland County, Sweden
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.6 × 1.1 × 0.9 cm
Description

Crystalline black armangite and brown katoprite

Mineral Data
What's on the rock

Armangite

Formula: 
Mn2+26(AsO3)14(HAsO3)4(CO3)
Strunz: 
4.JB.20
Crystal System: 
Trigonal
Hardness: 
4.0
Streak: 
Brown
Type Locality: 
Långban, Filipstad, Värmland, Sweden

Katoptrite

Formula: 
(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20
Strunz: 
9.AE.40
Hardness: 
5.5
Streak: 
red brown
Type Locality: 
Brattfors Mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden