General Information:
Chemical Formula:
Pb9Sb8S21
Composition:
(Molecular Weight = 3,512.19 gm)
Antimony 27.73 % Sb
Lead 53.10 % Pb
Sulfur 19.17 % S
Empirical Formula:
Pb9Sb8S21
Locality:
Felsobanya (Baia Sprie), Rumania.
Name Origin:
Named after the Hungarian collector of minerals, A. Semsy.
Physical Properties:
Cleavage:
[112] Good
Color:
black or gray.
Density:
5.8 - 6.1, Average = 5.94
Diaphaniety:
Opaque
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Spherical - Spherical, rounded aggregates., Tabular - Form dimensions are thin in one directio n.
Hardness:
2.5 - Finger Nail
Luster:
Metallic
Streak:
black
More details...