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Coquimbite Römerite & Voltaite

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FNW59188

Coquimbite Römerite & Voltaite

Description Tabs

Description
Locality: 
Dexter #7 Mine, Calf Mesa, Emery County, Utah, United States of America
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 9 × 4.6 cm
Description

Purple and blue coquimbite crystals, brown romerite and black voltaite crystals on matrix. At first glance we can see a few crystals of coquimbite with good crystallization.

Voltaite crystals are sharp with very well defined faces and edges.

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

Römerite

Formula: 
Fe2+Fe3+2(SO4)4·14H2O
Strunz: 
7.CB.75
Hardness: 
3.0 - 3.5
Type Locality: 
Rammelsberg Mine, Rammelsberg, Goslar, Harz, Lower Saxony, Germany

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
Fine Minerals World
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