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Bentorite & Volkonskoite

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CLB151635

Bentorite & Volkonskoite

M. Hanauer
Rare Mineral

Description Tabs

Description
Locality: 
Hatrurim Formation, Negev Desert, Israel
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.6 × 5.1 × 3.4 cm
Description

Purple veins of the very rare bentorite from the type locality. There should also be traces of the greenish volkonkoite, but if there are, they're too small to picture.

Mineral Data
What's on the rock

Bentorite

Formula: 
Ca6(Cr3+,Al)2(SO4)3(OH)12·26H2O
Strunz: 
7.DG.15
Crystal System: 
Hexagonal
Hardness: 
2.0
Type Locality: 
Hatrurim Formation, Negev, Israel

Volkonskoite

Formula: 
Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2·4H2O
Strunz: 
9.EC.40
Hardness: 
1.0 - 2.0
Type Locality: 
Efimyatskaya Mt, Efimyata Village, Kama River, Okhansk, Permskaya Oblast', Middle Urals, Urals Region, Russia...

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