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Gaudefroyite: Ca4Mn+++3-x(BO3)3(CO3)(O,OH)3
Comments: Dark gray, prismatic gaudefroyite with crystals to 1.5 cm. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.8 x 4.2 cm. © John Veevaert