Mineral - Chalcomenite
Chalcomenite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
low
Formula
CuSeO₃ · 2H₂O
Unit Cell
a=6.67 b=9.16 c=7.40 Z=4
Physical Properties
Hardness
2 - 2.5
Streak
blueturquoise
Density
Normal (2-3,5)
Cleavage
Fracture
conchoidal
Tenacity
Brittle
Optical Properties
Color
blue
Birefringence
0.020
Luster
Vitreous,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-disphenoidal - 222
Space Group
P2 1 2 1 2 1 (19)
Habit
tufty, crusty, spherical, acicular, kidney-shaped, prismatic, prismatic, radial, tabular
Formation
Secondary, in the oxidation zone of supergene Cu-Se deposits
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Chalcomenite
Composition
Elements
Mass
SeO₂
48.12
CuO
35.40
H₂O
15.30
Argentinia