allanite

 [al-uh-nahyt]  

al·lan·ite

   [al-uh-nahyt]
noun Mineralogy.
a member of the epidote group, a silicate of calcium, cerium, aluminum, and iron, occurring chiefly in brown-to-black masses or prismatic crystals.
Origin:
1835–45; named after Thomas Allan (1777–1833), English mineralogist; see -ite1

Related forms
al·la·nit·ic  [al-uh-nit-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Allanite is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Collins
World English Dictionary
allanite (ˈæləˌnaɪt)
 
—n
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(SiO4)3(OH)
 
[C19: named after T. Allan (1777--1833), English mineralogist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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