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Clinoclase & Gold On Malachite & Baryte

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CLB503034

Clinoclase & Gold On Malachite & Baryte

Classic Locality

Description Tabs

Description
Locality: 
Clara Mine, Wolfach, Black Forest, Baden-Württemberg, Germany
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.9 × 4.5 × 3.5 cm
Description

A dark blue clinoclase crystal aggregate is the main feature of this interesting combo specimen. The dark green material is most likely malachite, but could also be pseudomalachite or cornwallite. Looking at it with a pocket-microscope I discovered a lot of very tiny golden grains – unfortunately too small to photograph for me. Following good advice of a colleague I’ll have it tested while the auction is running. If it is really gold, that would be a little sensation for the Clara mine. So far I can only say it’s my visual ID and I cannot give a guarantee. There are more mineral species present amongst others the common matrix material baryte, quartz and maybe tennantite (gray).

Mineral Data
What's on the rock

Clinoclase

Formula: 
Cu3(AsO4)(OH)3
Strunz: 
8.BE.20
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Type Locality: 
Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

Gold

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

Malachite

Formula: 
Cu2(CO3)(OH)2
Strunz: 
5.BA.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0

Baryte

Formula: 
BaSO4
Strunz: 
7.AD.35
Hardness: 
3.0 - 3.5
Streak: 
White

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