Mineral - Bultfonteinite
Bultfonteinite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₂SiO₂(OH,F)₄
Unit Cell
Physical Properties
Hardness
4.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Distinct after {100} and {010}
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
orangepinkcolorless
Birefringence
0.010
Luster
Vitreous,
Silky
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
triclinic-pinacoidal - 1
Space Group
P 1 (2)
Habit
acicular, radial, grape-shaped
Formation
Pneumatolytic-hydrothermal, occurring as a late-stage process in calcium-rich kimberlites or skarns through the alteration of calcium-bearing silicates with the addition of fluorine and water at low temperatures.
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Bultfonteinite