Mineral - Gilmarite
Gilmarite
Chemical Properties
Mineral Class
Arsenates
Toxicity
low
Formula
Cu₃(AsO₄)(OH)₃
Unit Cell
a=5,45 b=5,87 c=5,10 α=115° β=93° γ=92° Z=1
Physical Properties
Hardness
3
Streak
greenblueblue green
Density
Cleavage
Gut auf (010)
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
greenblueblue green
Birefringence
0,070
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
leafy, spherical, acicular, rosette, radial, tabular
Formation
Oxidationszone von Kupfer-Lagerstätten
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Gilmarite
Composition
Elements
Mass
As₂O₅
30,20
CuO
62,70
H₂O
7,10
Frankreich
Groups and Members
Gilmarit-Gruppe