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A very low level of radioactivity would indicate that most of the pyritic sulphur had been driven off, taking with it the radioactive tags.
From Time Magazine Archive
A higher level would show that the organic sulphur had been eliminated, leaving behind the pyritic sulphur.
From Time Magazine Archive
When he applied ammonia, explained Keller, the raw coal broke down into fine particles, separating the purer hydrocarbons from rock and pyritic sulfur and significantly reducing its ash content.
From Time Magazine Archive
With regard to auriferous pyritic lodes, it does not appear even now to be clear, as some scientists assert, that their gold is never found in chemical combination with the sulphides of the base metals.
From Getting Gold: a practical treatise for prospectors, miners and students by J. C. F. (Joseph Colin Frances) Johnson
Brunton’s calciner, used in the “burning” of the pyritic minerals associated with tin ore, is a familiar example of this type.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various
