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M510 Columbite

M510 Columbite


Here is something very different from the Mineral department at the Rock Shed.  This is a larger, above average quality Columbite or Tantalum specimen from the Etta Mine in Keystone, South Dakota.  It measures 3 3/4″ x 2 5/8″ x 1 3/4″ and is very heavy for it’s size at over 2 1/2 pounds.  It has a dark black color and all natural rough exterior.  This mineral is attached to Soda-Spar as a secondary mineral.  This is one of our rarer minerals we have on hand, so if it sparks your interest, you will definitely have a one-of-a-kind mineral.  A really neat addition to any mineral collection.

In stock


Columbite, also known as Niobite or Niobite-Tantalite, is a black mineral that is an ore of Niobium and Tantalum. It has a sub-metallic luster and a high specific gravity. It is a Niobate of Iron and Manganese which contains Tantalate of Iron. Columbite has the same composition and crystal symmetry as Tantalite but the latter has a much greater specific gravity. It is used for heat resistance.

Additional information

Weight3.00 lbs
Dimensions3.75 × 2.625 × 1.75 in

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Keystone, SD 57751

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