Formation
(1) Primarily magmatic, as an accessory mineral in acidic plutonic rocks (granites, pegmatites) and alkaline rocks, formed by the enrichment of yttrium and heavy rare earth elements in the residual melt.
(2) Metamorphic in gneisses or formed by hydrothermal mobilization in alpine-type fractures.
(3) Due to its high mechanical and chemical resistance in alluvial placer deposits
