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Calcite with boulangerite inclusions - Herja mine, Baia Sprie, Maramures, Romania

Black and shiny calcite crystals in rhombohedrons flattened to the point of forming a spherical group of 3 cm in diameter, placed on a base of arsenopyrite. The black color is related to inclusions of boulangerite and/or jamesonite. Curious specimen of good quality from a discovery of the years 1980-1990 at the Herja mine in Romania, now closed.

4 x 4 x 2,8 cm.