Monazite definitions

mŏn'ə-zīt'
A reddish-brown phosphate mineral containing rare-earth metals, (Ce, La, Nd, Y, Th)PO4 , important as a source of cerium and thorium.
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A yellow or brownish-red native phosphate of the rare-earth elements, a major source of thorium, cerium, lanthanum, neodymium, etc.
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A yellow or reddish-brown monoclinic mineral that is a principal ore of several lanthanide (rare-earth) elements. It occurs as tabular crystals in pegmatites, granites, and metamorphic rocks, as well as in sand. Chemical formula: (Ce, La, Nd, Th)PO4.
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(mineralogy) Any of a range of reddish-brown minerals that are mixed phosphates of the lighter rare earth elements lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium and yttrium.
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Origin of monazite

Greek monazein to live alone monastery –ite