Germanite
Cu 52%, Fe 7%, Ge 9%, S 32%,

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


Solubility in organics = insoluble


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

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


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