单词 | howardite |
释义 | howarditen. 1. Mineralogy. A supposed silicate of iron and magnesium found in some meteorites. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > miscellaneous silicates > [noun] > supposed silicates howardite1848 alipite1853 zonochlorite1872 1848 C. U. Shepard in Amer. Jrnl. Sci. 6 253 The earthy constituent of this stone, like that of the Iowa meteorite..appears to be a tersilicate of the protoxyd of iron and magnesia, a mineral which though frequent in meteoric stones, has never yet been distinctly recognized, and which in a future paper on American Meteorites, I shall more particularly describe under the name of Howardite, after the Hon. Mr. Howard, that celebrated chemist, who was the first British writer whose labors contributed to elucidate the history of these extra~terrestrial bodies. 1955 M. H. Hey Index Mineral Species (ed. 2) 127 Howardite (of Shepard). A doubtful meteoritic silicate of Fe and Mg. 2. Astronomy. [ < German howardit (G. Rose 1863, in Physikal. Abhandl. d. K. Akad. d. Wiss. zu Berlin 29).] Any of a group of achondritic meteorites principally composed of hypersthene and anorthite. ΘΚΠ the world > the universe > constellation > comet or meteor > meteor > [noun] > meteorite > achondrite > types of eucrite1881 howardite1881 nakhlite1916 ureilite1916 the world > the earth > structure of the earth > constituent materials > stone > a stone > [noun] > meteorite > other meteorites air-stone1608 iron1802 aerolite1810 aerolith1811 uranolite1815 star-glint1825 brontolith1860 aerosiderite1863 aerosiderolite1863 pallasite1863 siderolite1863 siderite1866 mesosiderite1868 howardite1881 chondrite1883 oligosiderite1883 plessite1885 diogenite1895 achondrite1904 octahedrite1905 nakhlite1916 ureilite1916 stony-iron1918 micrometeorite1949 1881 L. Fletcher Guide Coll. Meteorites (Brit. Mus.) 17 Perhaps for those aerolites which contain little or no nickel-iron the division into Howardites, Eukrites, Chladnites, Chassignites, Shalkites, and Carbonaceous is the most convenient. 1915 O. C. Farrington Meteorites iii. 35 Of a total of nine meteorites belonging to the class of howardites, five have fallen in Russia. 1916 Mineral. Mag. XVIII. 36 The angrites, nakhlites, howardites, eucrites, and sherghottites..are richer in lime..than chondritic stones generally. 1971 B. Mason in I. G. Gass et al. Understanding Earth viii. 117 (table) [Achondrites are] sometimes divided into calcium-poor achondrites (aubrites, diogenites, chassignite, ureilite) and calcium-rich achondrites (angrite, nakhlite, howardites, eucrites). This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018). < |
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