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Bournonite Dolomite Galena & Boulangerite

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Bournonite Dolomite Galena & Boulangerite

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Description
Locality: 
Příbram District, Central Bohemian Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 4.2 × 4.5 cm
Largest Crystal: 
1.50cm
Description

Beautiful, multimineral specimen of very nice, well formed Bournonite crystal with Dolmite, lustrous Galena and small Quartz crystals on matrix with Sphalerite and Pyrite. There is also a "layer" of samll, acicular Boulangerite crystals on the bottem of the specimen.  Ex coll. H. Drygalski (1929-2005).

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

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

Galena

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

Boulangerite

Formula: 
Pb5Sb4S11
Strunz: 
2.HC.15
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Colour: 
Lead grey
Streak: 
Brownish
Type Locality: 
Molières, Gard, Languedoc-Roussillon, France

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