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Siderite & Sphalerite Psm Calcite

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CLB520958

Siderite & Sphalerite Psm Calcite

Pseudomorph

Description Tabs

Description
Locality: 
Aggeneys, Namakwa District, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.1 × 4.2 × 2.5 cm
Largest Crystal: 
3.50cm
Description

Very good specimen of this rare and unique epimorphs. The crystals are hollow, the 'shell' consisting of a nowhere else seen mix of siderite and sphalerite. The calcite crystals have been completely dissolved.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0

Calcite

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

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