microfelsiticadj.

Brit.

/ˌmʌɪkrə(ʊ)fɛlˈsɪtɪk/, U.S.

/ˈˌmaɪkroʊˌfɛlˈsɪdɪk/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: micro- comb. form, felsitic adj. at felsite n. Derivatives

Etymology: < micro- comb. form + felsitic adj. at felsite n. Derivatives, after German mikrofelsitisch (F. Zirkel Mikrosk. Beschaffenheit der Mineralien u. Gesteine (1873) 280).

Geology.

Of a rock: showing signs of incipient crystallization without there being any actual crystals; cryptocrystalline.

ΚΠ

1879 F. Rutley Study of Rocks x. 171 It yet remains to be shown whether micro-felsitic matter is inert upon polarised light.

1888 Amer. Naturalist 22 302 Felsodacites, with a microfelsitic ground mass.

1895 A. Harker Petrol. vii. 89 When the texture of the ground-mass sinks to such minuteness as to be not clearly resolved under the microscope, it may be described as cryptocrystalline (‘microfelsitic’ of some authors).

1939 A. Johannsen Descriptive Petrogr. Igneous Rocks (ed. 2) I. 222 Microfelsitic... Mikrofelsitisch (Ger.) was used for the groundmass of certain porphyries, differing from glass in having a certain faint beginning of crystallization without showing any particular individual crystals.

1968 Mineralogica et Petrographica Acta 13 340 The groundmass..shows various textures and structures (microfelsitic, felsitic,..and axiolitic).

1987 R. L. Bates & J. A. Jackson Gloss. Geol. (ed. 3) 420/1 Microfelsitic, cryptocrystalline.

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

单词	microfelsitic
释义	microfelsiticadj. Brit. /ˌmʌɪkrə(ʊ)fɛlˈsɪtɪk/, U.S. /ˈˌmaɪkroʊˌfɛlˈsɪdɪk/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: micro- comb. form, felsitic adj. at felsite n. Derivatives Etymology: < micro- comb. form + felsitic adj. at felsite n. Derivatives, after German mikrofelsitisch (F. Zirkel Mikrosk. Beschaffenheit der Mineralien u. Gesteine (1873) 280). Geology. Of a rock: showing signs of incipient crystallization without there being any actual crystals; cryptocrystalline. ΚΠ 1879 F. Rutley Study of Rocks x. 171 It yet remains to be shown whether micro-felsitic matter is inert upon polarised light. 1888 Amer. Naturalist 22 302 Felsodacites, with a microfelsitic ground mass. 1895 A. Harker Petrol. vii. 89 When the texture of the ground-mass sinks to such minuteness as to be not clearly resolved under the microscope, it may be described as cryptocrystalline (‘microfelsitic’ of some authors). 1939 A. Johannsen Descriptive Petrogr. Igneous Rocks (ed. 2) I. 222 Microfelsitic... Mikrofelsitisch (Ger.) was used for the groundmass of certain porphyries, differing from glass in having a certain faint beginning of crystallization without showing any particular individual crystals. 1968 Mineralogica et Petrographica Acta 13 340 The groundmass..shows various textures and structures (microfelsitic, felsitic,..and axiolitic). 1987 R. L. Bates & J. A. Jackson Gloss. Geol. (ed. 3) 420/1 Microfelsitic, cryptocrystalline. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < adj.1879
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