General Information:
Chemical Formula:
PbS
Composition:
(Molecular Weight = 239.27 gm)
Lead 86.60 % Pb
Sulfur 13.40 % S
Empirical Formula:
PbS
Environment:
Lead sulfide ore veins, and disseminated in igneous and sedimentary rocks.
Locality:
Joplin district of Missouri, Kansas, and Oklahoma and other world wide occurrences.
Name Origin:
The Roman naturalist, Pliny, used the name galena to describe lead ore.
Physical Properties:
Cleavage:
[001] Perfect, [010] Perfect, [100] Perfect
Color:
light lead gray or dark lead gray.
Density:
7.2 - 7.6, Average = 7.4
Diaphaniety:
Opaque
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Granular - Common texture observed in granite and other igneous rock., Massive - Uniformly in distinguishable crystals forming large m
Hardness:
2.5 - Finger Nail
Luminescence:
None.
Luster:
Metallic
Streak:
grayish black
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