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Prehnite

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SUR32987

Prehnite

Classic Locality

Description Tabs

Description
Locality: 
La Combe de la Selle, Saint Christophe-en-Oisans, Le Bourg-d'Oisans, Isère, Auvergne-Rhône-Alpes, France
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2 × 1.5 cm
Description

A lustrous, translucent, sea-green crystal of prehnite.

Prehnite specimens from La Combe de la Selle are among the finest known for the species.

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
Surrey Minerals