General Information:
Chemical Formula:Pb9Sb8S21
Composition:(Molecular Weight = 3,512.19 gm)Antimony 27.73 %
SbLead 53.10 %
PbSulfur 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
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