Xenotime
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Xenotime is a rare-earth phosphate mineral, the major component of which is yttrium orthophosphate. It forms a solid solution series with chernovite- and therefore may contain trace impurities of arsenic, as well as silicon dioxide and calcium. Wikipedia
Cleavage: Perfect
Color: Brown, brownish yellow, gray
Crystal class: Dipyramidal (4/mmm); H-M symbol: (4/m)
Crystal habit: Prismatic, radial aggregates, granular
Crystal system: Tetragonal
Formula (repeating unit): YPO4
IMA symbol: Xtm
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