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The article did not answer my question: Why is sulfur associated with volcanism? It is a literally universal phenomenon, most notably on Jupiter's moon Io, so clearly there is something critical being left unmentioned in this article. I suspect it is a combination of the element's abundance, density, and melting points, but I'm not sure how that interplay works out. Badon (talk) 09:15, 26 May 2014 (UTC)
Direct reactions between elemental sulfur and other elements
I have removed the following claim (formerly the last sentence of the opening paragraph):
The "except" portion directly contradicts the assertion in Wikipedia's own article on Iridium(III) sulfide, which specifically states that this compound can be "prepared by heating a mixture of elemental iridium and sulfur." An unfortunate complication: when I tried to find further documentation for this assertion, the reference I found described synthesis of a different compound, iridium disulfide [iridium(IV) sulfide], by direct reaction between the elements at atmospheric pressure. I have therefore created the new article Iridium(IV) sulfideIridium disulfide, using that reference. The basic point still remains: iridium and sulfur do react directly, contrary to the "except" clause of the claim I have removed.
I would have preferred to correct, rather than simply remove, the false claim. Unfortunately, to make this possible, a correct statement about the exact extent of sulfur's reactivity with other elements will need to be found in a source; synthesizing this information ourselves, from multiple sources, would be WP:OR (specifically, WP:SYNTH).