oncosinen.
/ˈɒŋkə(ʊ)siːn/, U.S. /ˈɑnkoʊˌsin/, /ˈɑŋkoʊˌsin/ Mineralogy. Now historical.
An aluminosilicate of potassium, other alkali metals, and magnesium which is a variety of, or perhaps a mixture containing, muscovite.
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the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > mica > muscovite > varieties
talcite1836
fuchsite1844
sericite1853
oncosine1854
adamsite1859
oellacherite1867
mariposite1868
gümbelite1871
hydro-muscovite1889
1854 J. D. Dana Syst. Mineral. (ed. 4) II. 504 Onkosin... In roundish pieces, having an apple-green color; sometimes grayish or brownish.
1868 J. D. Dana Syst. Mineral. (ed. 5) 480 Oncosin..occurs in roundish masses imbedded in dolomite with mica, at Passecken near Tamsweg, in Salzburg.
1923 Mineral. Abstr. 2 112 Muscovite, the variety onkosine is plentiful in the salbands of the lodes.
1939 Geol. Föreningens i Stockholm Förhandl. 60 622 The vein material in the pollucite, where late muscovite occurs in the somewhat unusual form of deep mauve-coloured, compact, cryptocrystalline masses, mineralogically referred to the subspecies oncosine.
1962 Mineral. Abstr. 15 393/2 Pegmatites with giant crystals of amblygonite, spodumene, and oncosine and aggregates of montebrasite.
1993 A. M. Clark Hey's Mineral Index (ed. 3) 508/1 Oncosine, aluminosilicate of Mg and K... The analysis indicates a muscovite, probably slightly altered.
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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