marcyliten.
/ˈmɑːsɪlʌɪt/, U.S. /ˈmɑrsiˌlaɪt/ Mineralogy.
An impure or altered form of copper sulphide from the Red River district of Louisiana.
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the world > the earth > minerals > types of mineral > sulphides and related minerals > [noun] > chalcocite group > copper sulphide
grey orea1728
redruthite1849
marcylite1853
chalcocite1868
1853 R. B. Marcy & G. B. McClellan Explor. Red River (U.S. War Dept.) (new ed.) i. 9 We found specimens of a very rich ore, which Professor Shephard, after a careful analysis, pronounced to be a new species, which he has called Marcylite.
1854 C. P. Shepard in R. B. Marcy & G. B. McClellan Explor. Red River (U.S. War Dept.) (new ed.) App. C. 155 On subjecting the black ore to a close investigation, it proves to be a substance hitherto undescribed, and it affords me much pleasure to name it, in honor of the very enterprising and successful explorer to whom mineralogy is indebted for the discovery, Marcylite.
1866 Amer. Jrnl. Sci. 91 210 Marcylite is described on page 405 of my [sc. Shepard's] Mineralogy; but from less pure specimens than those submitted to Mr. Tyler.
1896 A. H. Chester Dict. Names Minerals 167 Marcylite,..an uncertain alteration product from the decomposition of chalcopyrite.
1993 A. M. Clark Hey's Mineral Index (ed. 3) 436/1 Marcylite, an alteration product of copper sulphides.
This entry has been updated (OED Third Edition, December 2000; most recently modified version published online March 2022).
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