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Ettringite On Calcite

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PDM957187

Ettringite On Calcite

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.7 × 3.5 × 2.1 cm
Largest Crystal: 
0.80cm
Weight: 
20.00gr
Description

Lenticular pale yellow ettringite crystals that are doubly-terminated and have an hexagonal contour. They are implanted on a matrix of whitish-grey scalenohedral calcite, snow white oyelite and black hematite. Attractive cluster that is in good condition.

Acquired in 1995. Ex Bob Janssens #662.

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

Calcite

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

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