I'm not sure if this is the right thread to post it, but I have some general informations about the Philosopher Stone and the sulphur chemical element. These curiosities can be related to the manga / FMAB as well.
I hope that I'm not writing something that has already been said somewhere P:
Studying mineralogy for my next exam I've found out an interesting mineral that is the Cinnabar: http://en.wikipedia.org/wiki/Cinnabar
As you can see it is red as the philosopher stone should be, besides the chemical composition of this element is HgS that is mercury and sulphur. Well I've found out that this mineral was a chinese alchemical ingredient to reach the immortality and seems that some emperors died swallowing extracts of this mineral trying to lengthen their lives (due the mercury). Old chinese scrolls say that the famous "Terracotta Army" is surrounded by cinnabar rivers too. Isn't it similar to the whole Xing alchemy?
Besides in organic chemestry the SH (S=sulphur H=hydrogen) group is called "mercaptan". This word derives from latin and means "take the mercury" (mer=mercury* captio=take something) because compounds with this kind of group were used to extract the mercury. Now what this has to do with FMA? Well Kimbley's name "Zolf/Solf" is similar to the Italian (and other latin languages) word "zolfo" that means "sulphur" and funnily Kimbley has almost always a philosopher stone with him or two as seen in the manga and in FMAB
Probably I'm reading too much into it but it was funny to do this type of researches (and useful too 'cause I have to study these things)
is the exact latin word for the mercury element but lately they started to use the word mercurius
as the name of the god
Sources: Wikipedia and personal knowledges