trachyten.

Brit.

/ˈtreɪkʌɪt/,

/ˈtrakʌɪt/, U.S.

/ˈtræˌkaɪt/,

/ˈtreɪˌkaɪt/

Etymology: < French trachyte (Haüy); < Greek τρᾱχύς rough, or perhaps τραχύτης roughness.

Geology and Mineralogy.

A group of volcanic rocks, having a characteristically rough or gritty surface. The name was given by Haüy to certain volcanic rocks from Auvergne, and at first used in a wide sense; now confined to rocks consisting mainly of sanidine (or glassy orthoclase) feldspar, as distinguished from oligoclase- and quartz-trachytes, and intermediate forms: see trachy- comb. form 2.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > trachyte

trachyte1821

1821 R. Jameson Man. Mineral. 427 Rocks of extinct and ancient volcanoes... 1. Trachyte. This rock which is of the nature of felspar, is generally porphyritic, the imbedded crystals being most frequently of the glassy kind.

1830 C. Lyell Princ. Geol. I. 386 These isles are formed of brown trachyte..full of crystals of glassy felspar.

1854 R. I. Murchison Siluria xviii. 425 These were, in ancient times, penetrated by granites, porphyries, trachytes, and other eruptive matters.

1876 D. Page Adv. Text-bk. Geol. (ed. 6) v. 105 The trachytes are rough-grained subcrystalline varieties of felspathic lava.

1911 Encycl. Brit. XXVII. 116/2 Trachyte..was long used in a much wider sense..in fact it included quartz-trachytes (now known as liparites and rhyolites) and oligoclase-trachytes, more properly assigned to Andesites.

Compounds

attributive, as trachyte rock, trachyte porphyry; trachyte tuff n. a tuff having the composition and structure of trachyte.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > trachyte > varieties of

rhyolite1861

nevadite1868

propylite1868

trachyte tuff1885

ciminite1896

grorudite1896

hedrumite1896

kenyte1900

mugearite1904

1872 C. King Mountaineering in Sierra Nevada ix. 188 Rounded domes of trachyte rock.

1877 Tylor in Nature 5 July 191/1 In a still larger chulpa [i.e. Peruvian burial-tower] there are hewn trachyte blocks as large as twelve feet long [etc.].

1885 A. Geikie Text-bk. Geol. (ed. 2) ii. ii. vii. 166 Thus we have felsite-tuffs, trachyte-tuffs, basalt-tuffs, pumice-tuffs, porphyrite-tuffs, etc.

This entry has not yet been fully updated (first published 1913; most recently modified version published online March 2022).

单词	trachyte
释义	trachyten. Brit. /ˈtreɪkʌɪt/, /ˈtrakʌɪt/, U.S. /ˈtræˌkaɪt/, /ˈtreɪˌkaɪt/ Etymology: < French trachyte (Haüy); < Greek τρᾱχύς rough, or perhaps τραχύτης roughness. Geology and Mineralogy. A group of volcanic rocks, having a characteristically rough or gritty surface. The name was given by Haüy to certain volcanic rocks from Auvergne, and at first used in a wide sense; now confined to rocks consisting mainly of sanidine (or glassy orthoclase) feldspar, as distinguished from oligoclase- and quartz-trachytes, and intermediate forms: see trachy- comb. form 2. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > trachyte trachyte1821 1821 R. Jameson Man. Mineral. 427 Rocks of extinct and ancient volcanoes... 1. Trachyte. This rock which is of the nature of felspar, is generally porphyritic, the imbedded crystals being most frequently of the glassy kind. 1830 C. Lyell Princ. Geol. I. 386 These isles are formed of brown trachyte..full of crystals of glassy felspar. 1854 R. I. Murchison Siluria xviii. 425 These were, in ancient times, penetrated by granites, porphyries, trachytes, and other eruptive matters. 1876 D. Page Adv. Text-bk. Geol. (ed. 6) v. 105 The trachytes are rough-grained subcrystalline varieties of felspathic lava. 1911 Encycl. Brit. XXVII. 116/2 Trachyte..was long used in a much wider sense..in fact it included quartz-trachytes (now known as liparites and rhyolites) and oligoclase-trachytes, more properly assigned to Andesites. Compounds attributive, as trachyte rock, trachyte porphyry; trachyte tuff n. a tuff having the composition and structure of trachyte. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > trachyte > varieties of rhyolite1861 nevadite1868 propylite1868 trachyte tuff1885 ciminite1896 grorudite1896 hedrumite1896 kenyte1900 mugearite1904 1872 C. King Mountaineering in Sierra Nevada ix. 188 Rounded domes of trachyte rock. 1877 Tylor in Nature 5 July 191/1 In a still larger chulpa [i.e. Peruvian burial-tower] there are hewn trachyte blocks as large as twelve feet long [etc.]. 1885 A. Geikie Text-bk. Geol. (ed. 2) ii. ii. vii. 166 Thus we have felsite-tuffs, trachyte-tuffs, basalt-tuffs, pumice-tuffs, porphyrite-tuffs, etc. This entry has not yet been fully updated (first published 1913; most recently modified version published online March 2022). < n.1821
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