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Chrysocolla Psm Malachite Psm Azurite

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LGM683229

Chrysocolla Psm Malachite Psm Azurite

Ex Gunnar Färber, Germany
Classic Locality

Description Tabs

Description
Locality: 
Whim Creek Mine, Pilbara, Western Australia, Australia
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
3.5 × 7 × 4.5 cm
Largest Crystal: 
1.50cm
Weight: 
70.00gr
Description

This is a rare double pseudomorph showing a change of chemistry twice with a complete chrysocolla replacement of the original azurite crystal habit, with malachite as a transitional stage.
Oftenly the pseudomorphs get rounded with time and change but this one is quite sharp. The crystals are perched on a brown gossan matrix likely rich in Goethite, size of the main crystal is 15 mm.

A classic, old-time specimen from a defunct aussie locale.

Mineral Data
What's on the rock

Chrysocolla

Formula: 
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (x < 1)
Strunz: 
9.ED.20
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.5

Malachite

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

Azurite

Formula: 
Cu3(CO3)2(OH)2
Strunz: 
5.BA.05
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0
Type Locality: 
Chessy copper mines, Chessy-les-Mines, Le Bois d'Oingt, Rhône, Rhône-Alpes, France...

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