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hydro-muscovite
hydro-muscovite n.
Brit. 
/ˌhʌɪdrə(ʊ)ˈmʌskəvʌɪt/
, /ˌhʌɪdrə(ʊ)ˈmʌskəvʌɪt/U.S. /ˌhaɪdroʊˈməskəˌvaɪt/
Mineralogy a variety of muscovite containing more water and less potassium than that mineral./ˌhaɪdroʊˈməskəˌvaɪt/ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > mica > muscovite > varieties
talcite1836
fuchsite1844
sericite1853
oncosine1854
adamsite1859
oellacherite1867
mariposite1868
gümbelite1871
hydro-muscovite1889
1889 A. Johnstone in Q. Jrnl. Geol. Soc. 45 364 Margarodite, gilbertite, damourite, and sericite are mineralogists' names for varieties possessing the same composition as muscovite, differing from the latter mineral merely in containing at least about 5 per cent. of water. All of these varieties..ought to be known under one term. The common name proposed for them by the Author is hydromuscovite.
1966 W. A. Deer et al. Introd. Rock-forming Minerals 202 Hydromuscovites have high H2O and low K2O content.
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