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0 item @ $0.00  

Columbite-(Mn) in Montebrasite

#BN53108

Columbite-(Mn) in Montebrasite

#BN53108
Availability
Sold
Size
6.5 x 4 x 3.5 cm - Sm Cabinet 
Formula
Mn2+Nb2O6 (RRUFF)
Locality
Viitaniemi pegmatite, Eräjärvi area, Orivesi, Etelä-Suomen Lääni, Finland

A black Columbite crystal to 1.2cm in white Montebrasite. The old Kidwell labeled had Topaz in association. I believe it to by Quartz.

Columbite-(Mn)

Formula
Mn2+Nb2O6 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Tabular, Massive 
Cleavage
Distinct, Indistinct, None 
Luster
Sub Metallic 
Color
brownish black, black 
Streak
reddish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Subconchoidal 
Hardness

Data courtesy of Webmineral.

Collection
Dr. Buford Nichols Collection

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