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Prehnite Psm Anhydrite

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CLB501859

Prehnite Psm Anhydrite

Hu Hühne collection
Pseudomorph

Description Tabs

Description
Locality: 
Djouga-Kolon, Bendougou, Bafoulabé Circle, Kayes Region, Mali
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 7.3 × 4 cm
Description

This is one of two specimen I got at the mines in Mali, which show clearly a cast in prehnite. Rock Courier thought it's an epimorph after anhydrite. Unfortunately there's nothing left of the dissolved mineral.

Mineral Data
What's on the rock

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa

Anhydrite

Formula: 
CaSO4
Strunz: 
7.AD.30
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 3.5
Type Locality: 
Salt mine, Hall valley, Hall, Innsbruck, Inn valley, North Tyrol, Tyrol, Austria

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