metamict


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metamict

[′med·ə‚mikt]
(mineralogy)
Of a radioactive mineral, exhibiting lattice disruption due to radiation damage while the original external morphology is retained.
References in periodicals archive ?
One highly discordant fraction of partly metamict zircon grains plots to the left of this discordant trend, likely due to ancient Pb-loss, the age of which cannot be estimated reasonably from the data at hand.
In general, smaller grains were clear and free of inclusions, whereas larger grains tended to be slightly metamict.
The metamict grains are more discordant than the clear grains, although both types were highly abraded.