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Prehnite With Scolecite

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QRI796071

Prehnite With Scolecite

Former collection Christian Mavris
Classic Locality

Description Tabs

Description
Locality: 
Gneiss Quarries, Arvigo, Calanca, Moesa Region, Grisons, Switzerland
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 5 × 5.8 cm
Largest Crystal: 
1.10cm
Weight: 
241.00gr
Description

From the gneiss quarries of Arvigo, a rich vein specimen fully lined with numerous botryoidal aggregates of apple green prehnite with good lustre, aggregated as vermicular paths. Locally over the specimen, a few radial sprays of scolecite, plus some casts of adularia and lustrous pseudocubes of what I believe being apophyllite. 

Very rich for the locality. Not your usual Alpine specimen!

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

Scolecite

Formula: 
CaAl2Si3O10·3H2O
Strunz: 
9.GA.05
Hardness: 
5.0 - 5.5
Streak: 
white

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