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Prehnite & Stilbite

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CLB564375

Prehnite & Stilbite

from seller's own Wst African trip 2011

Description Tabs

Description
Locality: 
Sougounikoura Diggings, Arrondissement Diakon, Cercle de Bafoulabé, Kayes Region, Mali
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
15.7 × 10.4 × 9 cm
Weight: 
1 423.00gr
Description

Very big and heavy (almost one and a half kilo) apple-green prehnite specimen with a few creamy white stilbite crystals and some minor epidote.

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

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White

Seller Information

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