"I know, it's hard to believe, hee hee! But behold!" the masked alchemist rummages around in his sleeves...

"Let's see... So much junk... Where is it... Aha!"

And produces a rather large rock, struggling significantly to actually hold it aloft. About a foot and a half in diameter, roughly, and he drops it onto the ground with a loud crash.

"It's truly incredible, hahaha!"