A brown-to-yellow mineral that is a phosphate of yttrium in crystalline form

Wikipedia Word definitions in Wikipedia
Xenotime is a rare earth phosphate mineral , the major component of which is yttrium orthophosphate ( Y P O ). It forms a solid solution series with chernovite-(Y) ( Y As O ) and therefore may contain trace impurities of arsenic as well as silicon dioxide ...

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A yellow-brown mineral, yttrium phosphate (yttriumphosphorusoxygen 4 )

WordNet Word definitions in WordNet
n. a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Xenotime \Xen"o*time\, n. [Gr. ? honoring guests or strangers; xe`nos guest, stranger + ? honor: cf. G. xenotim.] (Min.) A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.