bultfonteinite

{{infobox mineral | name = Bultfonteinite | category = Nesosilicates | image = Bultfonteinite - Linxi, Chifeng City, Inner Mongolia, China.jpg | imagesize = 260px | caption = Bultfonteinite from Shijiangshan mine, China | formula = Ca2SiO2(OH,F)4 | IMAsymbol=Bul | molweight = | strunz = 9.AG.80 | dana = 52.4.7.2 | system = Triclinic | class = Pinacoidal ()(same H-M symbol) | symmetry = P | unit cell = a = 10.99 Å, b = 8.18 Åc = 5.67 Å, α = 93.95°β = 91.32°, γ = 89.85°; Z = 4 | color = Colorless, pink, light brown | habit = | twinning = Interpenetrating on {100} and {010}; polysynthetic | cleavage = Good on {100} and {010} | fracture = Conchoidal | tenacity = | mohs = 4.5 | luster = Vitreous | polish = | refractive = nα = 1.587nβ = 1.590nγ = 1.597 | opticalprop = Biaxial (+) | birefringence = δ = 0.010 | 2V = 70° (measured) | dispersion = r > v; barely perceptible | pleochroism = | fluorescence= | absorption = | streak = White | gravity = | density = | melt = | fusibility = | diagnostic = | solubility = Soluble in hydrochloric acid | diaphaneity = Transparent | references = }}

Bultfonteinite, originally dutoitspanite, is a pink, light-brown or colorless mineral with chemical formula Ca2SiO2(OH,F)4. It was discovered in 1903 or 1904 in the Bultfontein mine in South Africa, for which the mineral is named, and described in 1932.