Mineral - Chalcophanite
Chalcophanite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
ZnMn⁴⁺₃O₇ · 3H₂O
Unit Cell
Physical Properties
Hardness
2.5
Streak
brown
Density
Heavy (3,5-6)
Cleavage
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
blackbrown
Birefringence
0.000
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
rhombohedral - 3
Space Group
R 3 (148)
Habit
kidney-shaped, stalactitic, tabular
Formation
In the oxidation zone of manganese and zinc deposits
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Chalcophanite
Groups and Members
Chalcophanite-Group