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Gaudefroyite & Ettringite

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PDM957188

Gaudefroyite & Ettringite

Description Tabs

Description
Locality: 
NChwaning Mines, Kuruman, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 4.3 × 2.2 cm
Largest Crystal: 
1.40cm
Description

Very rich aggregate of black prismatic crystals of gaudefroyite with very good lustre, partially covered by a crust of pale yellow to white ettringite crystals.

Bought in 1990, it is an Ex J. Muizebelt specimen.

Combine specimens to reduce shipping costs!.

Mineral Data
What's on the rock

Gaudefroyite

Formula: 
Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Strunz: 
6.AB.60
Hardness: 
6.0
Type Locality: 
Tachgagalt Mine, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco

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

Seller Information

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