Mineral - Ullmannite
Ullmannite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
low
Formula
NiSbS
Unit Cell
Physical Properties
Hardness
5.5
Streak
blackgraygray black
Density
Very Heavy (>6)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgray
Birefringence
Luster
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Space Group
Habit
Octahedron, Cube
Formation
hydrothermal
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Ullmannite