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Charlesite: Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12·26(H2O)
Comments: 1 cm white crystal of charlesite on calcite with small (2 mm) octahedral crystals of galena. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Picture size 2.5 cm. © John Veevaert