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Umangite & Chalcomenite

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RBM127683

Umangite & Chalcomenite

Rare Mineral

Description Tabs

Description
Locality: 
Tumiñico Mine, Sierra de Cacho, Villa Castelli, Lamadrid Department, La Rioja, Argentina
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.3 × 3 × 3.2 cm
Description

Umangite violet-black with chalcomenite light blue to bluish green on a white matrix of cerussite.

Mineral Data
What's on the rock

Umangite

Formula: 
Cu3Se2
Strunz: 
2.BA.25
Crystal System: 
Tetragonal
Hardness: 
3.0
Streak: 
Black
Type Locality: 
Trogtal Quarries, Lautenthal, Harz, Lower Saxony, Germany

Chalcomenite

Formula: 
CuSeO3·2H2O
Strunz: 
4.JH.05
Crystal System: 
Orthorhombic
Hardness: 
2.0 - 2.5
Type Locality: 
Cerro de Cacheuta, Sierra de Cacheuta, Mendoza, Argentina

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