description: LOCALITY: Onganja Mine, Emke Farm, Namibia 1 7/8" across This crystallized copper displays a combination of octahedral crystals and spinel law twins. Although this piece is copper red, I do not believe it has been dipped in acid. Copper from many localities (including Ajo, Arizona) is a similar color and the composition of the native copper alloy is one of the factors that influences the patina. Onganja is a small copper mine that no longer produces and few copper specimens were found there when it did produce.
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