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Ahlfeldite Cobaltomenite & Favreauite

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Ahlfeldite Cobaltomenite & Favreauite

Classic Locality

Description Tabs

Description
Locality: 
El Dragón Mine, Quijarro Province, Potosi Department, Bolivia
Class: 
Crystals on Matrix
Size Range: 
Micromount (under 1cm)
Size: 
0.7 × 0.6 × 0.6 cm
Description

Very nice specimen of intense red-purple Ahlfeldite-Cobaltomenite series crystals (!), with very rare, (single and Type Location !) green aggregates of Favreauite (Selenite of Pb, Cu and Bi - unique combination of elements !) on matrix from classic lacation! Not tested, crystals are Ni-rich Cobaltomenite or Co-rich Ahlfeldite, both occurs on this locality.

Mineral Data
What's on the rock

Ahlfeldite

Formula: 
(Ni,Co)SeO3·2H2O
Strunz: 
4.JH.10
Crystal System: 
Monoclinic
Hardness: 
2.0 - 2.5
Type Locality: 
Virgen de Surumi mine (Pacajake mine; Pakajake mine), Pakajake Canyon (Pacajake Canyon), Chayanta Province, Potosí Department, Bolivia

Cobaltomenite

Formula: 
CoSeO3·2H2O
Strunz: 
4.JH.10
Crystal System: 
Monoclinic
Hardness: 
2.0 - 2.5
Streak: 
dark pink
Type Locality: 
Cerro de Cacheuta, Sierra de Cacheuta, Mendoza, Argentina

Favreauite

Formula: 
PbBiCu6O4(SeO3)4(OH)·H2O
Hardness: 
0.0
Type Locality: 
El Dragón mine, Antonio Quijarro Province, Potosí Department, Bolivia

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