websteriten.1
/ˈwɛbstərʌɪt/, U.S. /ˈwɛbstəˌraɪt/ Mineralogy. Now historical and rare.
A whitish mineral consisting of a hydrated basic sulphate of aluminium, typically occurring in opaque, clay-like masses; = aluminite n.
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the world > the earth > minerals > types of mineral > sulphates > [noun] > other simple sulphates > hydrous or hydrated
aluminite1805
websterite1823
mascagnine1836
morenosite1868
mallardite1883
szmikite1892
hexahydrite1911
minasragrite1915
retgersite1949
pentahydrite1951
1823 H. J. Brooke Familiar Introd. Crystallogr. 452 Alumine..sub-sulphate; Aluminite; Hallite; Websterite.
1855 J. Phillips Man. Geol. 386. At Newhaven, they much resemble the Woolwich beds in their zoological contents, and contain Websterite.
1985 Proc. Geologists' Assoc. 96 47/1 This material was referred to as websterite in the early literature but the name aluminite, which was coined at an earlier date for the same mineral at Epernay, France, has superseded it.
This entry has been updated (OED Third Edition, June 2017; most recently modified version published online December 2021).
websteriten.2
/ˈwɛbstərʌɪt/, U.S. /ˈwɛbstəˌraɪt/ Geology.
An ultramafic, ultrabasic rock formed in the cavities and fissures of other rocks and composed of approximately equal amounts of orthopyroxene and clinopyroxene, typically having a greyish, banded appearance.
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the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > other igneous
clay-stone1777
variolite1781
pyroxenite1845
aplite1862
anorthosite1863
teschenite1866
yellow ground1883
kimberlite1887
sanidinite1887
websterite1890
essexite1891
monzonite1895
missourite1896
theralite1898
heronite1899
kentallenite1900
carbonatite1924
wonderstone1936
1890 G. H. Williams in Amer. Geologist 6 44 The specimens obtained by Mr. Merrill from Webster are such admirable representatives of the bronzite-diopside rocks that the name Websterite is suggested..for them; and there seems to be no impropriety in extending this term over all the massive intrusives which are composed entirely of monoclinic and orthorhombic pyroxene.
1914 Jrnl. Geol. (Chicago) 22 805 The line of 52 per cent silica..is passed by the silica of some rocks placed by him in the ultrabasic group, e.g. websterite.
1978 S. R. Nockolds in S. R. Nockolds et al. Petrol. for Students xiii. 148 Pyroxenite with both ortho- and clinopyroxene (‘websterite’) is the commonest variety, found both in connection with some great layered igneous bodies..and in small intrusions.
2015 F. Santaguida et al. in W. D. Maier et al. Mineral Deposits Finland iii. vi. 202 Olivine websterite is the dominant rock type and host rock for the sulfide mineralization, defined locally as containing more than 5% orthopyroxene.
This entry has been updated (OED Third Edition, June 2017; most recently modified version published online December 2021).
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