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Gibbsite Psm Azurite

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AST153127

Gibbsite Psm Azurite

Pseudomorph

Description Tabs

Description
Locality: 
Kamariza Mines, Agios Konstantinos, Lavrion District, Attiki Prefecture, Greece
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3.5 × 3.2 cm
Description

This is something very rarely seen from Lavrion. Specimen is more than 20 years old and shows cavity filled with well shaped azurite crystals in isolated groups perfectly replaced by sky blue gibbsite.
Under magnification the very few broken crystals on specimen's edges show complete replacement while others still keep a bit of azurite blue (not complete replacement).Specimen has cavities all around!Also minor unaffected azurite crystal groups are spread on specimen.

Mineral Data
What's on the rock

Gibbsite

Formula: 
Al(OH)3
Strunz: 
4.FE.10
Hardness: 
2.5 - 3.0
Streak: 
White
Type Locality: 
Richmond, Berkshire Co., Massachusetts, USA

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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