Magnetite
Tarryall Springs Mining District, Park County, Colorado, USA
5.3 x 5.0 x 3.9 cm. A rare, large, sharp magnetite octahedron from an obscure Colorado locale. The lustrous, brownish-black crystal is essentially pristine. One corner and part of the out-of-sight back were sharply contacted against other crystals, but there is no damage, per se. Magnetic, as you would expect. A fine large Colorado rarity from the ...
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