Sylvanite

Sylvanite
Sylvanite from the Cripple Creek mining district
General
CategoryTelluride mineral
Formula(Ag,Au)Te2
IMA symbolSyv
Strunz classification2.EA.05
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP2/c
Identification
Formula mass429.89 g/mol
ColorSilver-grey, silver-white
Crystal habitMassive to crystalline
CleavagePerfect on the {010}
FractureUneven
TenacityBrittle
Mohs scale hardness1.5–2
LusterMetallic
StreakSteel grey
DiaphaneityOpaque
Specific gravity8.2
Density8.1
Optical propertiesAnisotropic
PleochroismNone
Ultraviolet fluorescenceNone
References

Sylvanite or silver gold telluride, chemical formula (Ag,Au)Te2, is the most common telluride of gold.

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