Gold
Chemical Formula	Au
Species	Native Elements
Crystal System	Isometric
Mohs Scale	2-3
Specific Gravity	15-19.3
Color	Rich yellow, paling to whitish-yellow with increasing silver; blue & green in transmitted light (only thinnest folia [gold leaf])
Streak	Shining yellow
Luster	Metallic
Diaphaneity	Opaque
Cleavage	None ObservedNone
Fracture	Hackly
Geological Setting：1) Primary hydrothermal veins 2) Volcanic 3) Alluvial