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Voltaite

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GMN737355

Voltaite

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Description
Locality: 
Szent Imre Mine, Mátraszentimre, Mátra Mountains, Heves County, Hungary
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.5 × 2 cm
Description

A lot of black, greyish various crystals on white-colourless tabular alunogen crystals . Amazing.

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

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