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Ettringite On Calcite

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Ettringite On Calcite

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3.6 × 1.4 cm
Largest Crystal: 
2.40cm
Weight: 
15.50gr
Description

The specimen is made up of fine grained lemon yellow ettringite on a cluster of lustrous calcite. The calcite have a high lustre and are in the 'dogs tooth' habit, some of them doubly terminated with the largest crystal reaching 2.4cm. Some of the calcite crystals have cleaved terminations.

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

Calcite

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

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