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Ettringite

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MNR855103

Ettringite

ex. Rudolf Ďuďa collection

Description Tabs

Description
Locality: 
Black Rock Mine, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.6 × 3 × 2.5 cm
Largest Crystal: 
0.50cm
Description

Fine cluster with a rich coverage of prisms of bright yellow/lemon colored Ettringite.
These Kalahari specimens came out many years ago, but they were quickly dried up from the market and are nowadays quite difficult to be found.

Very showy sample from Rudolf Ďuďa collection #6/231

Much better in person!

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