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Marienberg, Erzgebirge, Germany
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Proustite on native arsenic, Marienberg, Erzgebirge, Germany, formerly East Germany. On a 3.5 x 2.5 x 2 cm matrix of native arsenic, a cluster of distorted red crystals of proustite, a silver arsenic sulfide. Two historic handwritten labels, one by Gilbert Gauthier, the other by Michel Jouty of Chamonix