General Information:
Chemical Formula:
AuAg(S,Se)
Composition:
(Molecular Weight = 339.25 gm)
Silver 31.80 % Ag
Gold 58.06 % Au
Selenium 1.16 % Se
Sulfur 8.98 % S
Empirical Formula:
AuAgSe0.05S0.95
Environment:
Microscopic rims on gold particles.
Locality:
Maikain gold deposit, Kazakhstan.
Name Origin:
Named for Nina Petrovskaya (1910-), Russian mineralogist.
Physical Properties:
Color:
lead gray, dark grayish black, or black.
Density:
9.5
Diaphaniety:
Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Metallic - Dull
Streak:
dark gray
More details...