microperthiten.

Brit.

/ˌmʌɪkrə(ʊ)ˈpəːθʌɪt/, U.S.

/ˌmaɪkroʊˈpərˌθaɪt/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: micro- comb. form, perthite n.

Etymology: < micro- comb. form + perthite n., after German Mikroperthit (F. Becke 1882, in Mineral. u. petrogr. Mitteilungen 4 199).

Mineralogy.

A variety of perthite in which the lamellar structure is visible only under a microscope.

ΚΠ

1883 Science 25 May 464/1 The orthoclase was found to belong to the microperthite variety.

1885 A. Geikie Text-bk. Geol. (ed. 2) 132 F. Becke..described this structure and names it microperthite.

1895 A. Harker Petrol. iii. 40 An evident parallel intergrowth of..albite and orthoclase (microperthite) is also frequent in the same rocks.

1939 Geogr. Jrnl. 94 166 Plates of felspar, amongst which microperthite is fairly common.

1991 D. Flinn et al. in M. J. Salem et al. Geol. Libya VII. xv. 2540 The coarse tabular feldspars forming the syenites..crystallized as anorthoclase and now show various stages of unmixing from cryptoperthite to microperthite.

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

单词	microperthite
释义	microperthiten. Brit. /ˌmʌɪkrə(ʊ)ˈpəːθʌɪt/, U.S. /ˌmaɪkroʊˈpərˌθaɪt/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: micro- comb. form, perthite n. Etymology: < micro- comb. form + perthite n., after German Mikroperthit (F. Becke 1882, in Mineral. u. petrogr. Mitteilungen 4 199). Mineralogy. A variety of perthite in which the lamellar structure is visible only under a microscope. ΚΠ 1883 Science 25 May 464/1 The orthoclase was found to belong to the microperthite variety. 1885 A. Geikie Text-bk. Geol. (ed. 2) 132 F. Becke..described this structure and names it microperthite. 1895 A. Harker Petrol. iii. 40 An evident parallel intergrowth of..albite and orthoclase (microperthite) is also frequent in the same rocks. 1939 Geogr. Jrnl. 94 166 Plates of felspar, amongst which microperthite is fairly common. 1991 D. Flinn et al. in M. J. Salem et al. Geol. Libya VII. xv. 2540 The coarse tabular feldspars forming the syenites..crystallized as anorthoclase and now show various stages of unmixing from cryptoperthite to microperthite. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1883
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