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Kapnik, Romania
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Realgar, Kapnik, Romania. On a siliceous matrix measuring 5 × 3 × 2.5 cm, several patches of a beautiful red realgar, an arsenic sulphide. With a few crystalline forms. Handwritten label from the Gilbert Gauthier collection, on which he noted: Adam Collection No. 4818; it therefore originates from an exchange with the École des Mines de Paris.