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Cryptomelane

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SMM581555

Cryptomelane

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Description
Locality: 
Montaldo Mine, Borgata Oberti, Cuneo Province, Piedmont, Italy
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 2 × 2 cm
Description

In this sample, the calcite was carefully dissolved, with acid, to highlight these magnificent  steel-gray crystals of cryptomelane, a mineral which rarely occurs in crystals so showy. Excellent specimen.

Boxed with Label
Mineral Data
What's on the rock

Cryptomelane

Formula: 
K(Mn4+7Mn3+)O16
Strunz: 
4.DK.05a
Crystal System: 
Tetragonal
Hardness: 
5.0 - 6.5
Type Locality: 
Tombstone, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA

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