Mineral: Gypsum
Locality: Picher Field, Tri-State District, Ottawa County, Oklahoma, USA
Dimensions: 8.8 x 5.9 x 4.0 cm

Description: Colorless gypsum crystals to 0.9 cm with small reddish-brown sphalerite crystals covering the top surface of a gray chert matrix. Gypsum was an uncommon mineral in the Tri State District.

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