Of a mineral: converted into an amorphous state, with loss of internal crystal structure, as a result of natural radioactive decay of its constituent atoms.
Origin
1920s. From Danish metamikt from ancient Greek μετα- + μικτός mixed, blended.
Definition of metamict in US English:
metamict
adjectiveˈmɛtəmɪkt
Mineralogy
Of a mineral: converted into an amorphous state, with loss of internal crystal structure, as a result of natural radioactive decay of its constituent atoms.
Origin
1920s. From Danish metamikt from ancient Greek μετα- + μικτός mixed, blended.