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Demantoid & Prehnite

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CLB557464

Demantoid & Prehnite

Classic Locality

Description Tabs

Description
Locality: 
Tubussis Farm 22, Dâures, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4.5 × 2.5 cm
Description

Dark green demantoide crystals on matrix with a little prehnite and possibly some jahnsite crystals (brown, translucent).

Unfortunately the big demantoid crystals have a few dings.

Mineral Data
What's on the rock

Demantoid

Variety Of: 

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Hardness: 
6.5 - 7.0

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

Seller Information

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