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Calcite On Cryptomelane

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Calcite On Cryptomelane

Classic Locality

Description Tabs

Description
Locality: 
Mályi, Miscoic, Borsod-Abaúj-Zemplén County, Hungary
Class: 
Massive/Crystalline
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 9.5 × 6.3 cm
Description

Strange aggregate, formerly seen as botryoidal 'sand-calcite'.

But this specimen shows some 'blowholes' with the dark gray, metallic cryptomelane (not yet analyzed) peeking through the layer of calcite micro-crystals.

Mineral Data
What's on the rock

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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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