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Sjögrufvan, Sweden
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Neotokite, Sjögrufvan, Sweden. Specimen measuring 5 x 2.5 x 1.5 cm, on a milky quartz vein, a deposit of neotokite, an amorphous mineral, an iron and manganese silicate. Two handwritten historical labels, one from Deyrolle, the other from the Chervet collection.