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Columbite-(Fe)

#56322
SOLD
Columbite-(Fe) from Etta mine, Pennington Co., South Dakota, United States - 56322
Columbite-(Fe) from Etta mine, Pennington Co., South Dakota, United States - 56322

Columbite-(Fe)

#56322
Availability
Sold
Size
7 x 5 x 2.3 cm - Sm Cabinet 
Formula
Fe2+Nb2O6 (RRUFF)
Locality
Etta mine, Pennington Co., South Dakota, United States
Tagged
ore mineral , niobium

Basically a large "chunk" of Columbite from one of the most famous pegmatites in the world. The Etta mine produced lithium in the early years and eventually was known as a tin mine. Although it produced a little tin, it never survived as it was embroiled in one of the world's greatest mining scams. 

The specimen has one good flat face and has a little white cleavandite attached from its former and typical matrix.

Columbite-(Fe)

Formula
Fe2+Nb2O6 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Striated 
Cleavage
Distinct, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
blackish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
6 

Data courtesy of Webmineral.

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