Here is a link to egg-shaped pumice
http://web.archive.org/web/200112242...html?item=3641
Here is a link to patchnotes adding a cast time to it
http://www.mobhunter.com/mobhunter_a...430196769.html
I think at some point before they added a cast time, egg shaped pumice were removed from vendors, and replaced with crystallized. They added a cast time because a lot of people stockpiled the old ones, knowing they would be removed. According to
http://www.notacult.com/forums/happy...-em-quick.html it looks like sometime between 7-13 and 7-20 2000.