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Manganite & Calcite

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RSL709951

Manganite & Calcite

Classic Locality

Description Tabs

Description
Locality: 
Ilfeld, Nordhausen, Harz, Thuringia, Germany
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3.5 × 2.8 cm
Largest Crystal: 
1.00cm
Description

This specimen is formed by several manganite crystal aggregates, one of them of a good size, with striated prisms an complex terminal faces, filling a vug in the calcite matrix. Intense black color and luster. Nowadays, samples on calcite matrix are not very common. This is an old specimen from Freiberg Bergakademie.

Mineral Data
What's on the rock

Manganite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.15
Hardness: 
4.0
Type Locality: 
Manganese deposit, Ilfeld, Nordhausen, Harz, Thuringia, Germany

Calcite

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