Jamesonite
Fe 1%, Pb 4%, S 14%, Si 6%,

estimated elemental composition and molecular weight 
Minerals with the same name may vary widely in appearance and composition, and very few are >99% (reagent grade) pure.

Gram formula weight (molecular mass) = 1502.0


Minerals may vary in elemental composition and impurity levels.
Wikipedia Page:

Jamesonite
is defined with respect to the entities below:
The entities below are defined with respect to:
Jamesonite
Mineral (generic)


chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis