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Coquimbite & Voltaite

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SCH80171

Coquimbite & Voltaite

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Description
Locality: 
Rio Tinto Mines, Huelva, Andalusia, Spain
Size Range: 
Cabinet (10-18 cm)
Size: 
13.9 × 5.2 × 5.7 cm
Description

 A superb mass of bright purple coquimbite crystals nicely accented by several sulphates.

From my own collection, surely, the best coquimbite I've ever had!

Mineral Data
What's on the rock

Coquimbite

Formula: 
Fe2-xAlx(SO4)3·9H2O, x ~0.5
Strunz: 
7.CB.55
Hardness: 
2.5
Streak: 
white
Type Locality: 
Coquimbo Region, Chile

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
schani

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