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