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Analcime Calcite & Prehnite

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RAF711258

Analcime Calcite & Prehnite

Classic Locality

Description Tabs

Description
Locality: 
Brandberg, Dâures, Erongo Region, Namibia
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.9 × 6.5 × 1.8 cm
Largest Crystal: 
2.00cm
Weight: 
89.00gr
Description

A very nice large analcime crystal on a bed of calcite and Prehnite crystals on matrix. The specimen has been trimmed at the bottom to sit nicely. A very nice piece. 

Mineral Data
What's on the rock

Analcime

Formula: 
Na2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Crystal System: 
Triclinic
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Cyclopean Islands, Acitrezza (Aci Trezza), Etna Volcanic Complex, Catania Province, Sicily, Italy

Calcite

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

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