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Ettringite On Calcite

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SMS1084253

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 2.8 × 1.1 cm
Weight: 
6.11gr
Description

A plate formation of larger calcite crystals with tiny crystals of lemon yellow ettringite. The ettringite are tiny hexagonal dipyramidal discs that are so gemmy one almost cannot see their profile. The calcite are prismatic hexagonal crystals with high lustre. Overall in good condition. From finds in 2003.

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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Start 23 Nov 18:00
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$14
United States up to 1 kilogram
$18
Rest of world up to 500 grams
$14
Rest of world up to 1 kilogram
$18

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