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Groutite

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CHP832817

Groutite

Classic Locality

Description Tabs

Description
Locality: 
Emilie II Mine, Altweilnau, Weilrod, Hochtaunus, Darmstadt, Hesse, Germany
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 6 × 3.5 cm
Weight: 
320.00gr
Description

specimen with some groups of good black crystals of groutite on matrix.

c. 1330

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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