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Callaghanite

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Callaghanite

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Description
Locality: 
August Bebel Smelter Slag Locality, Helbra, Mansfeld Basin, Saxony - Anhalt, Germany
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 1.6 × 0.2 cm
Description

This rare Copper-Magnesium Carbonate occurs asa blue crystal-crust of several square-cm, together with red Cuprite and black Delafossite on 5 cm (NS) to 10 cm (HS) large Copper 
crystal-trees. Pretty specimens from a new find.

Mineral Data
What's on the rock

Callaghanite

Formula: 
Cu2Mg2(CO3)(OH)6·2H2O
Strunz: 
5.DA.25
Crystal System: 
Monoclinic
Hardness: 
3.0 - 3.5
Type Locality: 
Sierra Magnesite Mine (Premier Chemicals Mine; Gabbs Magnesite-Brucite Mine; Basic Refractories Mine; Basic Mine), Gabbs, Gabbs District, Paradise Range, Nye Co., Nevada, USA