Mineral - Clinoclase
Clinoclase
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
Cu₃[(OH)₃|AsO₄]
Unit Cell
a=12.38 b=6.46 c=7.26 β=99° Z=4
Physical Properties
Hardness
2.5 - 3
Streak
greenblueblue green
Density
Heavy (3,5-6)
Cleavage
Perfect after {001}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackblue
Birefringence
0.180
Luster
Vitreous,
Pearly
Transparency
translucent,
transparent
Pleochroism
Blau-Grün
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
P2 1 /c (14)
Habit
acicular, kidney-shaped, prismatic, rosette, tabular
Formation
In the oxidation zone of arsenic-rich copper deposits
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Clinoclase
Composition
Elements
Mass
P₂O₅
1.50
As₂O₅
27.08
Fe₂O₃
0.49
CuO
62.80
H₂O
7.57
England (Palache et al. 1952)