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18dwsd.ir ((COLUMBITE Fe-COLUMBITE Mn series)), $15 MINIMUM BID, Bob Ingersoll Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, 10 x 5.5 x 3.2 cm, Cabinet

Tabular Columbite crystal not that common from this well know South Dakota mine on a matrix of Feldspar. Columbite is an iron manganese niobium oxide

Sold For: $27
To: Australia48

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