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Kutnohorite With Sphalerite & Bournonite

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QRI837937

Kutnohorite With Sphalerite & Bournonite

Classic Locality

Description Tabs

Description
Locality: 
Huanuni Mine, Huanuni, Dalence Province, Oruro Department, Bolivia
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.6 × 6.2 × 4.2 cm
Largest Crystal: 
1.50cm
Weight: 
296.00gr
Description

An impressive specimen hosting half a dozen of pale pink kutnohorite cauliflowers elegantly developed on a matrix mostly composed of well-crystallized jet black sphalerite crystals. The biggest sphalerite, which looks like a twin, is 1.3 cm across. One blocky crystal belongs to a bournonite cogwheel and it is almost 1 cm across. Some pyrite traces across the specimen.
Very rich and in excellent conditions. Specimens of this kind are very rare to obtain nowadays. This one dates back to the mid 90s.

Mineral Data
What's on the rock

Kutnohorite

Formula: 
Ca(Mn,Mg,Fe)(CO3)2
Strunz: 
5.AB.10
Hardness: 
3.5 - 4.0
Type Locality: 
Poličany, Kutná Hora (Kuttenberg), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0

Bournonite

Formula: 
PbCuSbS3
Strunz: 
2.GA.50
Hardness: 
2.5 - 3.0
Type Locality: 
Wheal Boys (Trewetha Mine; Old Trewetha Mine), Port Isaac, St Endellion, Wadebridge District, Cornwall, England, UK

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