Niobite, or columbite, is a complex mineral with chemical formula [(Fe, Mn)(Nb, Ta)2O6]. It is orthorhombic and may be found in massive or granular form, or more rarely as well developed black crystals with a dull metallic lustre. It has the same composition and crystal symmetry as tantalite and the two are often considered a semi-singular mineral series, often referred to as coltan (for columbite-tantalite). Niobite is an ore for extracting niobium and tantalum, elements of essential use in various corrosion-resistant metal alloys. This is a single, though somewhat composite crystal from Ostfold, Norway, actual length 65 mm.
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Creative#:
TOP26739278
Source:
達志影像
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RM
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