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Kurnakovite: MgB3O3(OH)5·5(H2O)
Comments: Chalky white outer alteration, else gray, translucent, coarsely-crystalline kurnakovite. Location: The Open Pit, Boron, Kern Co., California, USA. Scale: 5x4x3cm. © Tom Loomis / Dakota Matrix
Comments: Very pale lilac-colored crystal of kurnakovite. Location: Boron, Kramer District, Kern County, California, USA. Scale: 7.2x4x2.5 cm. © Richard Dale / Dale Minerals