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Prehnite With Epidote

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QRI806040

Prehnite With Epidote

Former collection S.F.C. Adrian (UK) & R. Barstow (UK)
Classic Locality

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Description
Locality: 
La Combe de la Selle, Saint Christophe-en-Oisans, Le Bourg-d'Oisans, Isère, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
3.7 × 8.2 × 4.6 cm
Largest Crystal: 
1.60cm
Weight: 
227.00gr
Description

A 'chain' of flattened, very lustrous prehnite crystals populates the ridge of this metamorphic matrix specimen. At the end of the chain, a fully formed, standing prehnite crystal, with the typical for the locality habitus. Very intense green color and lustre for all crystals, they come associated to millimetricl green-yellow epidote crystals of great clarity (10x magnification advised for the latter).

Overall, the specimen is contrastful, as the matrix is overall pale. Crystals come with some peripheral contacts.

A representative Alpine classic from a locality that has provided some among the world's best prehnites. 

From the former renowned collections S.F.C. Adrian (UK) and R. Barstow (UK).

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

Epidote

Formula: 
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05a
Crystal System: 
Monoclinic
Hardness: 
6.0
Streak: 
Colorless
Type Locality: 
Bourg d'Oisans, Isère, Rhône-Alpes, France...

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