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Groutite

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SKY925152

Groutite

Rare Mineral

Description Tabs

Description
Locality: 
Hannover, Lower Saxony, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 2 × 1 cm
Description

Outstanding black groutite crystals in  a constrasting matrix from Germany.

Ex Vandenbroucke Museum collection from Waregem, Belgium.

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

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