Mineral - Bradaczekite
Bradaczekite
Chemical Properties
Mineral Class
Arsenates
Toxicity
none
Formula
NaCu₄(AsO₄)₃
Unit Cell
Physical Properties
Hardness
3.5
Streak
whiteblue white
Density
Heavy (3,5-6)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blue
Birefringence
0.200
Luster
Vitreous,
Adamantine
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/c (15)
Habit
crusty, prismatic, Rhombohedron, tabular
Formation
Paragenesis
Twinning
Rarity
Rare
Synonyms
Bradaczekite
Groups and Members
Alluaudite-Supergroup
Alluaudite-Group