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RM3199   Bournonite, galena, sphalerite and pyrite

Excellent specimen of bournonite from this classic Kosovar mine. Several crystals of this lead and copper sulfoantimonide are disposed on a matrix formed by brilliant crystals of pyrite, sphalerite and galena. The bournonite presents visible cyclic twins, semi-matt luster, with chalcopyrite. They appear covered with calcite that is removed by chemical processes.

Size: 12 x 8.7 x 5.8 cm.
Main crystal: 12 x 11 mm.
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