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Columbite-Fe with Muscovite, Albite
specimen number:
3774680
location:
Etta mine, Keystone, Pennington Co., South Dakota, USA
description:
A lustrous black crystal of columbite 2.2 cm on edge set on matrix. This is in great condition and very nice for the species from this locality. Identification has been confirmed. This was collected in 1981.
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