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Folvikite

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HEF1034575

Folvikite

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Description
Locality: 
Moss Mine, Nordmark, Filipstad, Värmland County, Sweden
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1.2 × 0.7 cm
Description

Black crystals of folvikite on matrix

Mineral Data
What's on the rock

Folvikite

Formula: 
Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4
Crystal System: 
Monoclinic
Hardness: 
6
Colour: 
Black to dark reddish-brown
Streak: 
Reddish-brown
Type Locality: 
Kitteln Mine, Nordmark Odal Field (Nordmarksberg), Filipstad, Värmland County, Sweden

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