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Columbite-(Mg)

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DPH89853

Columbite-(Mg)

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Description
Locality: 
Aracuai, Minas Gerais, Brazil
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3 × 2.5 cm
Description

Rare columbite Mg with nice striated crystals from Aracuai, Minas Gerais, Brazil.

Mineral Data
What's on the rock

Columbite-(Mg)

Formula: 
(Mg,Fe,Mn)(Nb,Ta)2O6
Strunz: 
4.DB.35
Crystal System: 
Orthorhombic
Hardness: 
6.5
Colour: 
Black
Type Locality: 
Muzeinaya pegmatite vein, Gem spinel Deposit, Kukh-i-Lal (Kukhilal; Kuhi-lal), Pyandzh River Valley, Pamir Mts, Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni), Tajikistan

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