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Cronstedtite

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MMM41170

Cronstedtite

Description Tabs

Description
Locality: 
Wheal Jane, Kea, Cornwall, United Kingdom
Size Range: 
Thumbnail (1-3cm)
Size: 
2.8 × 2.4 × 1.6 cm
Description

Superb thumbnail specimen displaying a matrix of quartz partly covered with compact acicular siderite on which sits many bright, sharp cronstedite crystals.

Specimen collected underground in May 1978

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