Mineral - Chlorapatite
Chlorapatite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
Ca₅(PO₄)₃Cl
Unit Cell
a=9.60 c=6.78 Z=2
Physical Properties
Hardness
5
Streak
white
Density
Normal (2-3,5)
Cleavage
Undeutlich auf (0001) und (10 1 0)
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
white
Birefringence
0.008
Luster
Vitreous,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
hexagonal
Point Group
hexagonal-dipyramidal - 6/m
Space Group
P6 3 /m (176)
Habit
blocky, massive, prismatic
Formation
By metamorphism in calc-silicate rock, magmatic in mafic intrusions, secondary as a substitute product of triphylite in granitic pegmatites
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Chlorapatite
Composition
Elements
Mass
P₂O₅
41.20
CaO
53.40
F
0.48
Cl
7.20
H₂O
0.09
Kanada
Groups and Members
Apatite-Supergroup
Apatite-Group