21hhdw.g ((COLUMBITE)), $50 MINIMUM BID, Barker-Ferguson Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA, 5.5 x 3 x .5 cm, Miniature | |
Flat crystal of Columbite, a Niobium oxide species. These are found in the Pegmatites and are difficult to extract in large crystals as this one from the matrix rock. ex Dana Wilson MD #367. |