General Information:
Chemical Formula:
Pb5Sb8S17
Composition:
(Molecular Weight = 2,555.12 gm)
Antimony 38.12 % Sb
Lead 40.55 % Pb
Sulfur 21.33 % S
Empirical Formula:
Pb5Sb8S17
Locality:
Wolfsberg, Hartz Mountains.
Name Origin:
From the Greek, plagios meaning "oblique."
Physical Properties:
Cleavage:
[112] Perfect
Color:
black or gray black.
Density:
5.4 - 5.6, Average = 5.5
Diaphaniety:
Opaque
Habits:
Tabular - Form dimensions are thin in one direction., Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Massive - Granular - Common texture observed in granite and other ign eous rock.
Hardness:
2.5 - Finger Nail
Luster:
Metallic
Streak:
reddish gray black
More details...