Columbite-(Fe)
Beecher Lode, Custer, Custer Mining District, Custer County, South Dakota, USA
A hefty and large subhedral columbite-(Fe) crystal from the obscure extinct pegmatites of the Beecher Lode of Custer County, that mined niobium, tantalum, beryllium and mica. The pristine black crystal has one sharp, very lustrous face. The remaining sides are contacted, with no damage. The bands of embedded muscovite add color and contrast. ...
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