Mineral: Sphalerite
Locality: Picher Field, Tri-State District, Ottawa County, Oklahoma, USA
Dimensions: 11.9 x 7.0 x 3.6 cm

Description: Resinous brownish-black sphalerite crystals to 2.5 cm with brassy epitaxic chalcopyrite and small “ruby jack” sphalerites on a shard of gray chert.

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