Mineral: Langbeinite
Locality: Kerr McGee Mine, Carlsbad Potash District, Eddy County, New Mexico, USA
Dimensions: 9.3 cm

Description: A rare potassium-magnesium sulfate found on the lower levels of the mine. This was one of the two primary ores mined for potassium in the district. Unfortunately, the mineral has a tendency to alter to white, chalky leonite after exposure to air for a few months.

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