Eucairite, Clausthalite, Umangite, Uraninite (Var: Pitchblende), Calcite

Locality: Předbořice, Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

Brownish-grey grain of Eucairite associated with white Clausthalite and lilac to greenish-grey (strong pleochroism!) grains of Umangite within dark-grey Calcite matrix. Note laths of eucairite within umangite grains - this is result of decay of solid solution CuAgSe within Cu3Se2. Grey spherulite of Pitchblende (with bright clausthalite inclusions) also present. Polished section in reflected light. FOV is ~1x0.75 mm. Pavel M. Kartashov collection and photo.

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Photo added: 25th Aug 2009

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