microliten.

Brit.

/ˈmʌɪkrə(ʊ)lʌɪt/, U.S.

/ˈmaɪkroʊˌlaɪt/,

/ˈmaɪkrəˌlaɪt/

Origin: Formed within English, by compounding. Etymons: micro- comb. form, -lite comb. form¹.

Etymology: < micro- comb. form + -lite comb. form¹. In sense 1 so named from the smallness of the crystals in which it was first found. In sense 2 after German Mikrolit (H. P. J. Vogelsang Philosophie der Geol. (1867) 139); compare microlith n. 1.

1. Mineralogy. Any of a subgroup of minerals of the pyrochlore group, found in various pegmatites, that are complex oxides of tantalum and niobium with sodium and calcium, often with small amounts of other elements such as uranium and titanium, crystallizing in the cubic system as yellow, brownish, or blackish translucent crystals.

ΘΚΠ

the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > oxides of titanium, tantalum, nickel, or rare earths > pyrochlore or microlite

pyrochlore1830

microlite1835

neotantalite1903

pandaite1959

bariopyrochlore1977

1835 C. U. Shepard in Amer. Jrnl. Sci. 27 361 Microlite, a New Mineral Species.

1862 J. D. Dana Man. Mineral. 208 The microlite of Prof. Shepard appears to be pyrochlore.

1950 Science 24 Mar. 312/1 Similar behavior has been noted for other minerals of the group described above..and especially for the mineral microlite.

1960 F. H. Pough Field Guide Rocks & Minerals (ed. 3) 147 Microlite is sometimes an ore of tantalum.

2000 Mineral. Mag. 64 514/2 Microlite minerals constitute a subgroup of the pyrochlore group of minerals.

2. Geology. A microscopic acicular crystal with determinable optical properties, found in microcrystalline rocks and groundmasses. Cf. crystallite n. 1b.

ΚΠ

1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 69 These bubbles, as well as the above-mentioned microlites.

1888 J. J. H. Teall Brit. Petrogr. 14 Microlites differ from crystallites in possessing the internal structure of true crystals.

1926 G. W. Tyrrell Princ. Petrol. v. 81 Microlites are somewhat larger bodies which can be definitely recognised as minute crystals.

1954 H. Williams et al. Petrogr. ii. 13 Extremely minute incipient crystals..are called microlites, provided they are birefringent; if they are even smaller, spherical, rod- and hair-like isotropic forms, they are called crystallites.

1993 Jrnl. Petrol. 34 182 Subphenocrysts and microlites from volcanic rocks of moderate alkalinity.

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

单词	microlite
释义	microliten. Brit. /ˈmʌɪkrə(ʊ)lʌɪt/, U.S. /ˈmaɪkroʊˌlaɪt/, /ˈmaɪkrəˌlaɪt/ Origin: Formed within English, by compounding. Etymons: micro- comb. form, -lite comb. form¹. Etymology: < micro- comb. form + -lite comb. form¹. In sense 1 so named from the smallness of the crystals in which it was first found. In sense 2 after German Mikrolit (H. P. J. Vogelsang Philosophie der Geol. (1867) 139); compare microlith n. 1. 1. Mineralogy. Any of a subgroup of minerals of the pyrochlore group, found in various pegmatites, that are complex oxides of tantalum and niobium with sodium and calcium, often with small amounts of other elements such as uranium and titanium, crystallizing in the cubic system as yellow, brownish, or blackish translucent crystals. ΘΚΠ the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > oxides of titanium, tantalum, nickel, or rare earths > pyrochlore or microlite pyrochlore1830 microlite1835 neotantalite1903 pandaite1959 bariopyrochlore1977 1835 C. U. Shepard in Amer. Jrnl. Sci. 27 361 Microlite, a New Mineral Species. 1862 J. D. Dana Man. Mineral. 208 The microlite of Prof. Shepard appears to be pyrochlore. 1950 Science 24 Mar. 312/1 Similar behavior has been noted for other minerals of the group described above..and especially for the mineral microlite. 1960 F. H. Pough Field Guide Rocks & Minerals (ed. 3) 147 Microlite is sometimes an ore of tantalum. 2000 Mineral. Mag. 64 514/2 Microlite minerals constitute a subgroup of the pyrochlore group of minerals. 2. Geology. A microscopic acicular crystal with determinable optical properties, found in microcrystalline rocks and groundmasses. Cf. crystallite n. 1b. ΚΠ 1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 69 These bubbles, as well as the above-mentioned microlites. 1888 J. J. H. Teall Brit. Petrogr. 14 Microlites differ from crystallites in possessing the internal structure of true crystals. 1926 G. W. Tyrrell Princ. Petrol. v. 81 Microlites are somewhat larger bodies which can be definitely recognised as minute crystals. 1954 H. Williams et al. Petrogr. ii. 13 Extremely minute incipient crystals..are called microlites, provided they are birefringent; if they are even smaller, spherical, rod- and hair-like isotropic forms, they are called crystallites. 1993 Jrnl. Petrol. 34 182 Subphenocrysts and microlites from volcanic rocks of moderate alkalinity. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1835
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