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Ettringite On Andradite

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SMS1055358

Ettringite On Andradite

Description Tabs

Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 2.9 × 1.3 cm
Largest Crystal: 
0.50cm
Weight: 
5.34gr
Description

Crystals of ettringite on a shallow more or less flat shelf of orange andradite. The ettringite has hexagonal prismatic crystals with some of them doubly terminated. The yellow colour is slightly muted for the species but remains fairly bright. The largest crystal to 0.5cm.

Mineral Data
What's on the rock

Ettringite

Formula: 
Ca6Al2(SO4)3(OH)12·26H2O
Strunz: 
7.DG.15
Hardness: 
2.0 - 2.5
Type Locality: 
Ettringer Feld, Western lava flow, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway

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