Metamict

metamict \ˈme-tə-mikt\ adjective: (of a mineral) having a disrupted crystal structure due to radiation damage from internal radioactive impurities

Etymology: origin unknown

I should confess that the etymology is only unknown to me. Meta- comes from Greek by way of Latin and means “among, with, after.” As for mict, any guesses? The Latin word micturire means “to desire to urinate,” but I doubt that has anything to do with it!