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Ettringite

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PDM961558

Ettringite

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 4.2 × 2 cm
Weight: 
19.00gr
Description

Cluster formed almost exclusively by hundreds of transparent yellow ettringite crystals that are well exposed in some cavities, doubly-terminated and of an hexagonal contour. Minor black hausmannite and red andradite are also present the rear.

Ex J. Muizebelt specimen, who bought it in 1991.

Combine specimens to reduce shipping costs!.

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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