I've Been trying to find a Classic use for crystallized sulfur and I haven't been able too.
It drops from a lot of the inhabitants of old sebilis.
I haven't been able to find any mention of it dropping pre 2002 which makes me think it was released with luclin.
It does appear crystallized sulfur was used for spell research when it was revamped and a couple luclin quests.
If you plug in the crystallized sulfur page from allakhazam into the way back machine results only start to populate from 2002 +
(
http://everquest.allakhazam.com/db/item.html?item=8218)
and allakhazam has a lot of results from the year 2000 + in the internet archive usually every couple months.
Fairly certain this was luclin for the spell research and a few quests.