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0 item @ $0.00  

Columbite-(Fe)

#55860

Columbite-(Fe)

#55860
Availability
Sold
Size
6 x 7 x 5.5 cm - Sm Cabinet 
Formula
Fe2+Nb2O6 (RRUFF)
Locality
Etta mine, Pennington Co., South Dakota, United States
Tagged
pegmatite mineral

There are at least six plates of Columbite in this specimen, three of which are quite nice and show nice terminations and measure about 1.5cm exposed but continues through matrix to about 3cm. Then there are numerous smaller blades all of the pegmatite matrix which is largely Microcline, Quartz and Muscovite.

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

Data courtesy of Webmineral.

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