$400.00
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.
| Weight | 3.00 lbs |
|---|---|
| Dimensions | 3.75 × 2.625 × 1.75 in |
