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Voltaite & Copiapite

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MNR184382

Voltaite & Copiapite

Description Tabs

Description
Locality: 
Zastávka, Brno, South Moravian Region, Czech Republic
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3.4 × 2.9 cm
Description

Black voltaite crystals associated with yellow copiapite from old burning coal dumps. Small orange/red crystals of unidentified mineral are also present.

Mineral Data
What's on the rock

Voltaite

Formula: 
K2Fe2+5Fe3+3Al(SO4)12·18H2O
Strunz: 
7.CC.25
Hardness: 
3.0 - 3.5
Type Locality: 
Solfatara di Pozzuoli, Pozzuoli, Phlegrean Fields, Naples Province, Phlegrean Volcanic Complex, Campania, Italy

Copiapite

Formula: 
Fe2+Fe3+4(SO4)6(OH)2·20H2O
Strunz: 
7.DB.35
Hardness: 
2.5 - 3.0
Type Locality: 
Copiapó Province, Atacama Region, Chile
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