howarditen.
/ˈhaʊədʌɪt/ 1. Mineralogy. A supposed silicate of iron and magnesium found in some meteorites.
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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.
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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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