Arsenopyrite
Mispickel
As 1%, Fe 1%, S 1%,

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) = 162.83


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

Arsenopyrite
is defined with respect to the entities below:
The entities below are defined with respect to:
Arsenopyrite
Arsenopyrites


Mineral (generic)


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