Mineral - Gratonite
Gratonite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
middle
Formula
Pb₉As₄S₁₅
Unit Cell
Physical Properties
Hardness
2.5
Streak
black
Density
Very Heavy (>6)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgray
Birefringence
Luster
Metallic
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
Space Group
Habit
prismatic, radial, columnar
Formation
hydrothermal
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Gratonite
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