Jennamite

Jannomite is a fictional mineral of the avatar universe. Also known as, "Creeping Crystal". This is for the reason that the mineral grows really fast. The Jannomite is fashioned into rings and placed over a persons finger. The mineral grows around the finger and over the body until it has incased the victim within. It is unknown if a person that that is incased within the mineral dyes or simply trapped. Turns out that Jannomite is made up of rock candy.