Mineral: Gypsum
Locality: Polkowice-Sieroszowice mining area, Sieroszowice, Gmina Radwanice, Polkowice, Lower Silesian Voivodeship, Poland
Dimensions: 7.3 x 6.4 x 3.7 cm

Description: Prismatic gypsum crystals to 2.3 cm in length tinted black by an unknown mineral.

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