1 definition by TheRando

Top Definition
This material is believed to have mystical properties, but is unable to be studied due to its nature of suddenly disappearing.

Can occasionally turn surroundings lime green.
Person 1: Did you see what made that massive green crater in the east?

Person 2: Yeah, there was a lump of Randonium, but its gone now.
by TheRando July 26, 2012

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