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Prehnite Epidote & Garnet

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CSW812066

Prehnite Epidote & Garnet

Collected by John & Robert Lawson
Classic Locality

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Description
Locality: 
An Gearna, Ben More, Isle of Mull, Scotland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 8 × 4.7 cm
Weight: 
446.00gr
Description

A fine locality example of a cavity filled with white prehnite crystals. Prior to the crystallization of the prehnite the cavity was lined with green epidote crystals followed by red/brown garnet crystals. The garnet crystals also appear dotted through the prehnite crystals. An interesting paragenesis which also includes of pale pink unidentified acicular micro crystals. LC

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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