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Sterling, USA
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Gahnite, Sterling, New Jersey, USA. Specimen 7.5x5.5x4cm, gahnite is an aluminum oxide classified as dysluite by Chervet, but is in fact a gahnite rich in iron and manganese. Gahnite is a member of the spinel group. Black octahedral crystals up to 1.4cm. Three historical handwritten labels, including Deyrolle et coll. Chervet.