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Gold With Jarosite

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LGM780695

Gold With Jarosite

Ex K. Pliester, Bergheim, Germany
Classic Locality

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Description Tabs

Description
Locality: 
Siglo Veinte Mine, Llallagua, Rafael Bustillo, Potosi Department, Bolivia
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 1.5 × 1 cm
Weight: 
2.70gr
Description

This specimen features mostly circular flakes of gold scattered on massive brown jarosite matrix (pic 1).
There are further unidentified minerals and beautiful details for the micromounters: Crystals of an unidentified, lemon-yellow mineral are perched on jarosite crystals lining a vug (pic 3), other vugs are filled with more orange-colored balls of a further unidentified mineral (pic 4).

Over 130 minerals are described for the Siglo Veinte (Siglo XX) mine, so this specimen maybe worth a further analysis.

Mineral Data
What's on the rock

Gold

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

Jarosite

Formula: 
KFe3+ 3(SO4)2(OH)6
Strunz: 
7.BC.10
Crystal System: 
Trigonal - Pyramidal Class
Hardness: 
2.5 - 3.5
Type Locality: 
Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora (Cuevas de Vera), Almería, Andalusia, Spain

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