What is "bultfonteinite"

n. (context mineral English) A triclinic-pinacoidal mineral containing calcium, fluorine, hydrogen, oxygen, and silicon.

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