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Oyelite: Ca10B2Si8O29·12(H2O) Bultfonteinite: Ca2SiO2(OH,F)4
Comments: White encrustation of oyelite covering brownish botryoidal bultfonteinite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa.
Scale: 2 x 4 cm.
© John Veevaert