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Minerals - Gold | TerraCollect
Mineral - Gold
Gold
Au
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Chemical Properties
Mineral Class
Elements
Toxicity
none
Formula
Au
Unit Cell
a=4.08 Z=4
Physical Properties
Hardness
2.5 - 3
Streak
yellow
Density
Very Heavy (>6)
Optical Properties
Color
gold
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Composition
Elements
Mass
Au
99.60
Cu
0.10
Ag
0.10
England (Palache et al. 1952)
Groups and Members
Copper-Group
Cleavage
Fracture
hooked
Tenacity
Elastic-flexible
hexoctahedral - 4/m
3
2/m
Space Group
Fm
3
m (225)
Habit
leafy,
dendritic,
dodecahedron,
Octahedron,
skeletal,
Cube
Formation
hydrothermal
Paragenesis
Twinning
Contact twins after {111}, Spinel-law
Rarity
Rather rare
Synonyms
Gold,
Native Gold
