Formula: Ca2SiO2(OH,F)4
Origin of name: From locality; Bultfontein diamond mine, Kimberley, South Africa
Crystal system: Triclinic
Crystal class: -1
Twinning: Interpenetrating on {100} and {010}, polysynthetic
Unit cell: a = 10.992 Å, b= 8.183 Å, c = 5.671 Å, a = 93.95°, b = 91.32°, g = 89.85°
Colour: Colourless to pink
Diaphaneity: Transparent
Habit: Crystals acicular, radiated; spherulitic masses
Hardness: 4.5
Specific gravity: 2.73
Cleavage: 2; {010} and {100} distinct
Tenacity: Conchoidal fracture
Synonyms/varieties:
Comments:
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