nacriten.
/ˈneɪkrʌɪt/, U.S. /ˈneɪˌkraɪt/ Mineralogy.
1. A clay mineral related to kaolinite and usually occurring as masses of tiny colourless or white scales.
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the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > kandites > kaolinite > varieties
kaolin1728
nacrite1808
pholerite1826
gilbertite1830
tuesite1837
china-clay1840
teratolite1868
1808 T. Allan Alphabet. List Minerals 48 Nacrite Brong. 243.
1816 R. Jameson Syst. Mineral. (ed. 2) I. 524 Nacrite, Brongniart... Its colours are cream-yellow, greenish-white, and greenish-grey.
1836 T. Thomson Outl. Mineral. I. 245 This mineral occurs usually in mica slate, taking the place of the mica; so that the rock..constitutes a mixture of nacrite and quartz.
1876 J. Harley Royle's Man. Materia Med. (ed. 6) 127 Potash is found in most of the alkaline-earthy minerals, as mica, felspar, leucite, and nacrite.
1930 Amer. Mineralogist 15 34 There are at least three distinct kaolin minerals—kaolinite, dickite, and nacrite.
1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) viii. 154 Several of the so-called clay minerals..have different proportions of silica and water from the common kaolinite; dickite, nacrite, allophane, beidellite, montmorillonite, and halloysite.
1992 W. A. Deer et al. Introd. Rock-forming Minerals (ed. 2) 357 Kaolinite is the most important member of the kaolinite group; dickite and nacrite are rarer polymorphs.
2. A green variety of muscovite. rare. Now historical.
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1836 T. Thomson in Rec. Gen. Sci. 3 333 I restrict the name nacrite and apply it only to a mineral from America, which I analysed and described in the year 1827.
1884 Amer. Naturalist 18 185 Geinitz has described a pseudomorph of nacrite after fluorite, in which the nacrite partially filled a crystal of fluorite.
1993 A. M. Clark Hey's Mineral Index (ed. 3) 479/2 Nacrite (of Thomson), var. of muscovite.
This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).
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