I played on Rallos Zek back at launch and these were required items for PvP when facing druids/rangers. It wasn't Crystallized Pumice though - that was added as a replacement for Egg-Shaped Pumice which was deemed too powerful for PvP servers, It had 5 charges of instant cast Pillage Enchantment. All Egg-Shaped Pumice left in player inventory eventually got retroactively nerfed to be the same as Crystallized but not in Project1999's timeline.
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http://everquest.allakhazam.com/db/item.html?item=3641
You can check it's Allah page and it has references from 2000 about "quickly" removing snares in PvP - 3.0 sec cast time probably wouldn't be considered quickly.
Note that posts from as late as April 2001 and December 2000 mention it still being vendor purchasable for 16-20 plat.
You can also find rules for the Test of Tactics (GM sanctioned server-wide PvP duels) where Crystallized Pumice is one of the few clickable items allowed but Egg-Shaped Pumice was explicitly disallowed, probably due to it being instant cast.
http://thedruidpages.tripod.com/main_page.htm
More confirmation from a Safehouse thread where someone asks where to get Egg-Shaped Pumice in 2002 after it had been nerfed:
"Different item, egg-shaped have zero casting time and are the pre-nerf version of the crystallized pumice(which are currently sold at vendors)."
https://thesafehouse.org/forums/foru...d-pumices-drop
Even more confirmation - again from the Safehouse in a post from December 2001. A thread of PvP hints that mentions Egg-Shaped Pumice having the same function as Golem Metal Wand (which is basically a non-vendor purchased Egg-Shaped Pumice), and specifically mentioning it being different than Crystallized Pumice.
https://thesafehouse.org/forums/foru...ogue-community
Note at this point on the timeline the Egg-Shaped had been removed from vendors but people had bought bags of them before the nerf and were re-charging them via vendors. So it got removed from vendors somewhere between late April and December 2001.