Description: Boulangerite and Cosalite Trepca, Yugoslavia; Kara Oba Tungsten, Qaraghandi Oblysy, Kazakhstan 8 x 14 x 4 cm; 5 x 6 x 3 cm Boulangerite: Frohberg Collection, Gift of Inco Limited. Cosalite: Purchased by the Royal Ontario Museum with the assistance of a Moveable Cultural Property grant accorded by the Minister of Canadian Heritage under the terms of the Cultural Property Export and Import Act. Louise Hawley Stone Charitable Trust.

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