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Chalcopyrite Malachite & Dolomite

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PDM746875

Chalcopyrite Malachite & Dolomite

Description Tabs

Description
Locality: 
Azcárate Quarry, Eugui, Esteríbar, Navarre, Spain
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5.2 × 3.1 cm
Largest Crystal: 
3.60cm
Description

This is a highly uncommon and hard to find specimen of crystallized chalcopyrite form a world-class locality for gemmy twinned dolomite. The main disphenoidal chalcopyrite crystal reach 36 mm in size, is very well formed and coated by a thin layer of green malachite. It has a minor chipping, exposing the golden interior, but the size and uncommon locality justify its inclusion in this auction.

The matrix is composed of white to transparent dolomite crystals with good lustre and classic contact twins on {1000}. From a limited find made by Francisco Maello (ES) in 1991. The Azcárate Quarry is closed and restored.

Mineral Data
What's on the rock

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

Malachite

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

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

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