pinguiten.
/ˈpɪŋɡwʌɪt/, U.S. /ˈpɪŋˌɡwaɪt/ Mineralogy. Now rare.
An oil-green mineral with a waxy consistency that is probably a variety of nontronite (chloropal).
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the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > smectites > nontronite
pinguite1831
nontronite1832
fettbol1835
volkonskoite1844
gramenite1858
morencite1904
1831 Amer. Jrnl. Sci. 20 197 Pinguite, a new argillaceous mineral.
1850 C. G. B. Daubeny Introd. Atomic Theory (ed. 2) xii. 410 Silicates that contain water..in which the water is simply united to the silicic combination... Example: Pinguite.
1928 Amer. Jrnl. Sci. 215 10 A large number of names have been proposed for the hydrous silicates of ferric iron; and of these nontronite, chloropal, pinguite, fettbol, and graminite are recognized by most mineralogists as belonging to the species nontronite.
1960 Current Sci. (Bangalore) 29 16 X-ray and other investigations indicate that pinguite cannot be classed with the chlorites, but may possibly represent a variety of chloropal.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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