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allanite

[al-uh-nahyt]
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noun Mineralogy.
  1. a member of the epidote group, a silicate of calcium, cerium, aluminum, and iron, occurring chiefly in brown-to-black masses or prismatic crystals.
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Origin of allanite

1835–45; named after Thomas Allan (1777–1833), English mineralogist; see -ite1
Related formsal·la·nit·ic [al-uh-nit-ik] /ˌæl əˈnɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for allanite

allanite

noun
  1. a rare black or brown mineral consisting of the hydrated silicate of calcium, aluminium, iron, cerium, lanthanum, and other rare earth minerals. It occurs in granites and other igneous rocks. Formula: (Ca,Ce,La,Y) 2 (Al,Fe,Be,Mn,Mg) 3 (SiO 4) 3 (OH)
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Word Origin

C19: named after T. Allan (1777–1833), English mineralogist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012