allanitic

allanite

[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

allanitic [al-uh-nit-ik] , adjective
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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]

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