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Prehnite Quartz Calcite & Epidote

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RAF49224

Prehnite Quartz Calcite & Epidote

Description Tabs

Description
Locality: 
Brandberg, Dâures, Erongo Region, Namibia
Size Range: 
Cabinet (10-18 cm)
Size: 
10.2 × 6.9 × 4.8 cm
Largest Crystal: 
3.00cm
Description

An exquisite grouping of quartz on matrix, with green prehnite, black epidote and white calcite. Some of the quartz has a little amethyst. Will make a very good display piece. #A1296

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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...