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Kutnohorite & Groutite

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RAF541813

Kutnohorite & Groutite

New Discovery

Description Tabs

Description
Locality: 
NChwaning I Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2.5 × 2 × 3 cm
Largest Crystal: 
2.50cm
Weight: 
9.00gr
Description

Kutnahorite & groutite sheath specimen from N'Chwaning I Mine, Kalahari Manganese Field, Northern Cape, South Africa.  Contact marks on the back. This specimen looks better in the pictures than in the real...

Mineral Data
What's on the rock

Kutnohorite

Formula: 
Ca(Mn,Mg,Fe)(CO3)2
Strunz: 
5.AB.10
Hardness: 
3.5 - 4.0
Type Locality: 
Poličany, Kutná Hora (Kuttenberg), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

Groutite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.10
Hardness: 
3.5 - 4.0
Type Locality: 
Sagamore Mangan No. 2 pit, Ironton, Cuyuna North Range, Crow Wing Co., Minnesota, USA