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Cronstedtite

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ESM219052

Cronstedtite

Description Tabs

Description
Locality: 
Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
Size Range: 
Small cabinet (7-10 cm)
Size: 
4.8 × 9.8 × 8 cm
Description

Black trigonal cronstedtite crystals on matrix

Mineral Data
What's on the rock

Cronstedtite

Formula: 
Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Strunz: 
9.ED.15
Crystal System: 
Monoclinic, Trigonal, Hexagonal
Hardness: 
3.5
Type Locality: 
Příbram, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic