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Columbite-(Fe) & Columbite-(Mn)

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MNR760496

Columbite-(Fe) & Columbite-(Mn)

Alexander Falster

Description Tabs

Description
Locality: 
Emmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, United States of America
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 2.2 × 0.6 cm
Description

Striated and terminated black crystal of Columbite - Fe & Mn series.

Ex. Alexander Falster specimen

 

Mineral Data
What's on the rock

Columbite-(Fe)

Formula: 
FeNb2O6
Strunz: 
4.DB.35
Hardness: 
6.0
Type Locality: 
Green's Well pegmatite (Green's Tank), Pilgangoora, Wallareenya Station, Port Hedland Shire, Western Australia, Australia...

Columbite-(Mn)

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