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Ettringite

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MGR917558

Ettringite

Classic Locality

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Description
Locality: 
Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 2.7 × 1.8 cm
Description

 The specimen seems to consist of sharp discs. It is not pure Ettringite - this is a mineralogical oddity. The is only a minor chemical difference between Ettringite and Sturmanite.  And this crystal unify both compounds - the darker discs are Sturmanite, the the lighter discs are Ettringite. 

The crystal is set on the typical almost black matrix, it is complete all around with some minor inter-grown matrix. The end-points are mostly sharp, only one side seems to have no more room (but that´s really small). So rare, colorful, perfectly in your size and aesthetic.

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

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Start 18 Jun 18:00
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Shipping Information

Postage Area Price
Austria 5
5
Europe 14
14
North America 16
16
Rest of World 19
19