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schorlomite

schorlomite Min.
  (ˈʃɔːləmaɪt)
  Also erron. schorlamite, schorlemite.
  [irreg. f. schorl; named by Shepard 1846 from its resemblance to that mineral.]
  A vitreous black silicate of titanium, iron and calcium, resembling garnet.

1846 C. U. Shepard in Amer. Jrnl. Sci. Ser. ii. II. 252 Fragments of pure schorlomite an inch in diameter..may be detached from this skeleton-crystal. 1858 J. Nicol Elem. Min. 275 Sphene, Titanite... Schorlamite, black shining..from Arkansas, is related. 1883 Encycl. Brit. XVI. 426/1 Schorlomite (Ferrotitanite)... Perhaps a titaniferous garnet.

Oxford English Dictionary

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