General Information:
Chemical Formula:
Pb4FeSb6S14
Composition:
(Molecular Weight = 2,064.07 gm)
Iron 2.71 % Fe
Antimony 35.39 % Sb
Lead 40.15 % Pb
Sulfur 21.75 % S
Empirical Formula:
Pb4Fe2+Sb6S14
Name Origin:
Named after the Scottish Mineralogist, R. Jameson (1774-1854).
Physical Properties:
Cleavage:
[001] Perfect
Color:
lead gray, steel gray, or dark lead gray.
Density:
5.5 - 5.63, Average = 5.56
Diaphaniety:
Opaque
Habits:
Acicular - Occurs as needle-like crystals., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Massive - Fibrous - Distinctly fibrous fine-graine d forms.
Hardness:
2.5 - Finger Nail
Luminescence:
None.
Luster:
Metallic
Streak:
black. grayish
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