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Montebrasite & Columbite-(Mn)

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PDM754678

Montebrasite & Columbite-(Mn)

Description Tabs

Description
Locality: 
Viitaniemi Pegmatite, Eräjärvi, Orivesi, Pirkanmaa, Finland
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.4 × 3.6 × 2.3 cm
Description

Black crystallized columbite-(Mn) in a matrix of white montebrasite and greenish gilbertite. Rare material from the old Viitaniemi pegmatite.

Ex. Gerard Vogel specimen.

Mineral Data
What's on the rock

Montebrasite

Formula: 
LiAl(PO4)(OH)
Strunz: 
8.BB.05
Hardness: 
5.5 - 6.0
Streak: 
White
Type Locality: 
Montebras Mines, Montebras, Soumans, Creuse, Limousin, France

Columbite-(Mn)

Formula: 
(Mn,Fe)(Nb,Ta)2O6
Strunz: 
4.DB.35
Hardness: 
6.0

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