metamictadj.

Brit.

/ˈmɛtəmɪkt/, U.S.

/ˈmɛdəˌmɪkt/

Origin: A borrowing from Danish. Etymon: Danish metamikt.

Etymology: < Danish metamikt (W. C. Brøgger 1893, in Salmonsens Konversationsleksikon 1 743/2) < ancient Greek μετα- meta- prefix + μικτός mixed, blended (see mictic adj.).The verb μεταμιγνυμι cited by Brøgger is not attested in ancient Greek. Compare ancient Greek μεταμίσγειν to mix among.

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. Also: designating this state.

ΘΚΠ

the world > the earth > minerals > change processes > [adjective] > metamict

metamict1927

1927 London, Edinb., & Dublin Philos. Mag. 7th Ser. 4 525 Metamict substances like xenotime and thorite have probably been formed under very high pressure.

1950 Science 24 Mar. 312/2 For materials which are completely metamict, it would be possible to determine only a minimum age.

1965 G. J. Williams Econ. Geol. N.Z. xiii. 203/2 He suggested the red colouration occurs only in pegmatites sufficiently old for the transformation of the radioactive mineral to the metamict state.

1998 Nature 3 Sept. 56/2 The actinide-bearing mineral thorite is isostructural with zircon and..is frequently found to be metamict (amorphous).

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metamict
释义	metamictadj. Brit. /ˈmɛtəmɪkt/, U.S. /ˈmɛdəˌmɪkt/ Origin: A borrowing from Danish. Etymon: Danish metamikt. Etymology: < Danish metamikt (W. C. Brøgger 1893, in Salmonsens Konversationsleksikon 1 743/2) < ancient Greek μετα- meta- prefix + μικτός mixed, blended (see mictic adj.).The verb μεταμιγνυμι cited by Brøgger is not attested in ancient Greek. Compare ancient Greek μεταμίσγειν to mix among. 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. Also: designating this state. ΘΚΠ the world > the earth > minerals > change processes > [adjective] > metamict metamict1927 1927 London, Edinb., & Dublin Philos. Mag. 7th Ser. 4 525 Metamict substances like xenotime and thorite have probably been formed under very high pressure. 1950 Science 24 Mar. 312/2 For materials which are completely metamict, it would be possible to determine only a minimum age. 1965 G. J. Williams Econ. Geol. N.Z. xiii. 203/2 He suggested the red colouration occurs only in pegmatites sufficiently old for the transformation of the radioactive mineral to the metamict state. 1998 Nature 3 Sept. 56/2 The actinide-bearing mineral thorite is isostructural with zircon and..is frequently found to be metamict (amorphous). This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < adj.1927
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