Nesosilicate (insular SiO4 groups)
Specific gravity: 2.73
Colour: Colourless, pink
Solubility: Gelatinised by acids
Common impurities: B,Al,Na,P
At the Fuka mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Japan, bultfonteinite is associated with oyelite, scawtite and xonotlite (HOM).
At the N'Chwaning II mine, Kuruman, Kalahari manganese field, Northern Cape, South Africa, acicular bultfonteinite to 1 cm is associated with crystals of poldervaartite to 8 mm (AJM 10.1.37).
At the type locality, the Bultfontein mine, KEM JV Mine, Kimberley, Sol Plaatje, Frances Baard, Northern Cape, South Africa, bultfonteinite was found in a large mass of dolerite and shale fragments in a kimberlite pipe, associated with calcite, apophyllite and natrolite (AM 18.32, HOM).
At the Commercial Quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Riverside county, California, USA, bultfonteinite occurs in a contact zone in thermally metamorphosed limestone, associated with afwillite and scawtite (AM 40.900-904, HOM).
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