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Groutite

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RSL687668

Groutite

Description Tabs

Description
Locality: 
Zavalye, Haivoron District, Kirovohrad Oblast, Ukraine
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.7 × 1.7 cm
Description

Globular aggregates of groutite crystals, very brilliant and deep black color. Groutite is a rare manganese oxide hydroxide, member of the diaspore group. From this Ukanian locality, one of the largest graphite deposits in Europe. Not very common on the mineral market.

Mineral Data
What's on the rock

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