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Ettringite In Gypsum

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CLB507729

Ettringite In Gypsum

Classic Locality

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
16.8 × 13.3 × 3 cm
Largest Crystal: 
3.00cm
Weight: 
1 045.00gr
Description

A plate of waterclear gypsum (variety 'marienglas'), containing several complete and broken lemon-yellow ettringite crystals up to 3.0 cm. There are a few hollow casts from ettringite crystals in the gypsum, some with yellow remnants, some without.

The last piece of this rare material.

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

Gypsum

Formula: 
CaSO4·2H2O
Strunz: 
7.CD.40
Hardness: 
2.0
Streak: 
White.

Seller Information

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