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Voltaite & Coquimbite

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ESM524568

Voltaite & Coquimbite

Description Tabs

Description
Locality: 
Dexter #7 Mine, Calf Mesa, Emery County, Utah, United States of America
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.1 × 2.2 cm
Description

Lustrous dark green octahedral voltaite crystals on purple coquimbite crystals

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

Coquimbite

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