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Metavoltine Magnesiocopiapite Halotrichite

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SMM644443

Metavoltine Magnesiocopiapite Halotrichite

Description Tabs

Description
Locality: 
Argentiera Della Nurra Mine, Sassari Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3 × 2 cm
Description

Pale yellow masses of microcrystals of magnesiocopiapite, silky-white tufts of hair-like crystals of halotrichite, golden-yellow, hexagonal, tabular, metavoltine crystals. A good sample of sulphates from a recent personal find.

Boxed with Label
Mineral Data
What's on the rock

Metavoltine

Formula: 
Na6K2FeFe6(SO4)12O2·18H2O
Strunz: 
7.DF.35
Hardness: 
2.5
Type Locality: 
Zagh Mine (Tangeh Zagh mine; Madeni Zakh), Haji Abad town, Bandar Abbas (Bandar-e Abbas), Bandar-Abbas County, Hormozgan Province, Iran

Magnesiocopiapite

Formula: 
MgFe3+4(SO4)6(OH)2·20H2O
Strunz: 
7.DB.35
Hardness: 
2.5 - 3.0
Type Locality: 
Blythe, Riverside Co., California, USA

Halotrichite

Formula: 
FeAl2(SO4)4·22H2O
Strunz: 
7.CB.85
Hardness: 
1.5 - 2.0
Streak: 
White

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