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Boulangerite

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BSM86694

Boulangerite

ex Pearl Freeman Collection #F959

Description Tabs

Description
Locality: 
Old Treburgett Mine, St Teath, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 2.8 × 3.2 cm
Description

Predominantly a siderite matrix with galena and possible freibergite.  Two small cavities adorn the top of the display face and these are lined with small quartz crystals and black metallic hair-like crystals of boulangerite.  This is a rare mineral for Cornwall, Old Treburgett being one of three or four known locations.

Mineral Data
What's on the rock

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
Provenance

Pearl Freeman Collection

Wed, 2015-07-22 22:52 -- admin
Some History
Dates: 
Post War- 
2011
Type: 
Collector/Collection
Specialisms: 
Baryte, United Kingdom, Peru, Sulphides
About

Pearl and her husband Sid were enthusiastic mineral collectors for several decades; Pearl was also long time treasurer of the British...

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