metamict

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Related to Metamictization: Metamict Minerals

metamict

(ˈmɛtəˌmɪkt)
adj
(Chemistry) of or denoting the amorphous state of a substance that has lost its crystalline structure as a result of the radioactivity of uranium or thorium within it: metamict minerals.
[C19: from Danish metamikt, from meta- + Greek miktos mixed]
ˌmetamictiˈzation, ˌmetamictiˈsation n
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References in periodicals archive ?
Webb et al., "Release of uranium from highly radiogenic zircon through metamictization: the source of orogenic uranium ores," Geology, vol.
For this reason exposure time, or, in other words, the age of zircons together with the enrichment in uranium and thorium, plays a relevant role in the degree of metamictization of each deposit.
The crystals can show etch figures indicating that conditions changed near the end of the crystallization; these figures could be confused with signs of incipient metamictization, but the mineral is not metamict.
The very low grade of metamictization of these allanites (as shown by the X-ray diffraction patterns) is consistent with the chemical composition.
Optical data: Isotropic (due to metamictization), n between 1.931 and 1.935.