Sphalerite with Marcasite, Chalcopyrite, Dolomite

specimen number:
2212372

location:
Picher Field, Tri-State District, Oklahoma, USA

description:
A large crystal grouping of semi lustrous sphalerite measuring 8.0 x 7.5 x 6.5 cm in size standing straight up from a brecciated chert matrix. The matrix is mostly coated with light pink to colorless crystals of dolomite. The sphalerite crystals are scattered throughout with small golden crystals of marcasite and chalcopyrite. Slight micro-damage present, this still very nice all around.

Located in Ottawa County, Oklahoma, the Picher Field was the primary producing area of the famous Tri-State Mining District, situated within the Ozark Plateau region. The geology features Mississippi Valley-type ore deposits where hydrothermal mineralizing fluids deposited lead and zinc sulfides, primarily sphalerite and galena, within fractured Precambrian and Mississippian limestone and chert formations. Active mining began in the early 20th century, quickly elevating Picher to one of the largest producers of zinc and lead in the world, which supplied vast quantities of metal during both World Wars. In addition to commercial ore production, the field became legendary among mineral collectors for producing magnificent specimens of lustrous galena cubes, razor-sharp sphalerite crystals, and associated secondary minerals like chalcopyrite and dolomite. Production ceased in the late 1960s, leaving behind extensive underground workings and environmental issues that eventually made the city part of a major federal superfund cleanup site.

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