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Gold With Arsenopyrite

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LGM1001736

Gold With Arsenopyrite

Ex G. Lehnen, Mönchengladbach, Germany
Classic Locality

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Description Tabs

Description
Locality: 
Uncía, Bustillos Province, Potosi Department, Bolivia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 2.6 × 1 cm
Weight: 
2.90gr
Description

Some mm-sized gold blebs are perched on crystalline arsenopyrite, embedded in massive white quartz matrix.

I assume a transcription error in the locality: There is no Unica Mine in Llalagua, but Uncía is a nearby town. The area is - apart from that - famous for tin mining.
According to newer information, most specimens in collections labelled "Uncia" are probably really from the Siglo Veinte mine, Llallagua (cit. mindat).

Mineral Data
What's on the rock

Gold

Formula: 
Au
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0

Arsenopyrite

Formula: 
FeAsS
Strunz: 
2.EB.20
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0

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