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Bournonite Galena & Calcite

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SCH75952

Bournonite Galena & Calcite

Description Tabs

Description
Locality: 
Nikolayevskiy Mine, Dalnegorsk, Primorskiy Kray, Russian Federation
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.6 × 5.4 × 4.3 cm
Description

An exceptional bournonite crystal is set on cubic octahedral galena with some melted faces. Smaller bournonite crystals are forming clusters scattered throughout.

Minor chalcopyrite and sphalerite are present. The whitish calcite subparallel rosettes add a pretty  contrast.

Very good specimen. 

Mineral Data
What's on the rock

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

Galena

Formula: 
PbS
Strunz: 
2.CD.10
Crystal System: 
Isometric
Hardness: 
2.5
Colour: 
Lead-grey
Streak: 
Lead-grey

Calcite

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

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