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Bultfonteinite: Ca2SiO2(OH,F)4 Poldervaartite: (Ca,Mn++)2SiO3(OH)2
Comments: Bow-tie clusters of white, acicular bultfonteinite and blocky, beige-colored poldervaartite on matrix. Location: N'Chwaning mine, South Africa. Scale: picture size 4 cm. © John Veevaert
Bultfonteinite: Ca2SiO2(OH,F)4
Comments: Rounded, spherical aggregation of acicular bultfonteinite crystals. Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 8.5 x 4.6 cm. © John Veevaert
Bultfonteinite: Ca2SiO2(OH,F)4 Oyelite: Ca10B2Si8O29·12(H2O)
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