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Ettringite On Calcite

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SMS1089058

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 4.9 × 3.5 cm
Weight: 
99.58gr
Description

The specimen has a fragment of brecciated banded ironstone covered with what appears to be lizardite. The fragment of matrix is almost wedge shaped. The head of the stone fragment has a deposit of spiky calcite crystal points and is deposited of fine grained ettringite. The calcite reach up to 1.5cm some of them are incomplete.

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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