A reddish-brown mineral containing rare earth metals

• An important source of thorium and cerium

WordNet Word definitions in WordNet
n. a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) 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

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Monazite \Mon"a*zite\ (m[o^]n"[.a]*z[imac]t), n. [From Gr. mona`zein to be solitary, in allusion to its isolated crystals.] (Min.) A mineral occurring usually in small isolated crystals, -- a phosphate of the cerium metals.

Wikipedia Word definitions in Wikipedia
Monazite is a reddish-brown phosphate mineral containing rare earth metals. It occurs usually in small isolated crystals . It has a hardness of 5.0 to 5.5 on the Mohs scale of mineral hardness and is relatively dense , about 4.6 to 5.7 g/cm. There are at ...