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Minerals - Bultfonteinite | TerraCollect
Mineral - Bultfonteinite
Bultfonteinite
Caâ‚‚SiOâ‚‚(OH,F)â‚„
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Caâ‚‚SiOâ‚‚(OH,F)â‚„
Unit Cell
Physical Properties
Hardness
4.5
Streak
white
Density
Normal (2-3,5)
Optical Properties
Color
orange
pink
colorless
Birefringence
0.010
Luster
Vitreous,
Silky
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
Karten-Ebenen
Geologische Karte
Satelliten Karte
Cleavage
Distinct after {100} and {010}
Fracture
conchoidal
Tenacity
Brittle
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
