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Andradite & Prehnite

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MGR787696

Andradite & Prehnite

Floater

Description Tabs

Description
Locality: 
Arrondissement Diakon, Cercle de Bafoulabé, Kayes Region, Mali
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3 × 2.7 cm
Description

Really a spectacular combination - one modififed dark olive-green to yellow andradite in the center of a hemisphere of light green prehnite. The specimen is developed as floater and represents a very uncommon, very rare combination.

Mineral Data
What's on the rock

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway

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