Mineral - Wulffite
Wulffite
Chemical Properties
Mineral Class
Sulphates
Toxicity
none
Formula
K₃NaCu₄O₂(SO₄)₄
Unit Cell
a=14,28 b=4,95 c=24,11 Z=4
Physical Properties
Hardness
2.5
Streak
green
Density
Normal (2-3,5)
Cleavage
Perfekt, parallel zu (010) und zur c-Achse
Fracture
hooked
Tenacity
Brittle
Optical Properties
Color
green
Birefringence
0,133
Luster
Vitreous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
coarse, crusty, massive, tabular
Formation
Sublimation an vulkanischen Fumarolen
Paragenesis
Twinning
Rarity
Rare
Synonyms
Wulffite
Composition
Elements
Mass
Na₂O
4,1
K₂O
16,5
Rb₂O
1,0
Cs₂O
0,7
CuO
38,9
ZnO
0,2
SO₃
39,1
Russland