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Prehnite & Epidote

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MCH615692

Prehnite & Epidote

Description Tabs

Description
Locality: 
Holmestrand, Vestfold, Norway
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.1 × 7.7 × 5.5 cm
Description

A 4 cm cavity in a basaltic lava is filled with a number of pale green coloured „prehnite-balls“ showing partly a clear crystalline structure. In a second 1.5 cm cavity dark green epidote spheres are found.

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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