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Voltaite

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MNR853872

Voltaite

Description Tabs

Description
Locality: 
Sulphur Hole, Calico, San Bernardino County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.5 × 1.2 cm
Description

Greenish-black crystals of voltaite on halotrichite. Yellow associated mineral is copiapite.

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