The fluoride minerals containing essential yttrium include tveitite-(Y) (Y,Na)6Ca6Ca6F42 and gagarinite-(Y) NaCaY(F,Cl)6.

[1][2] YF3 can be produced by reacting fluorine with yttria or yttrium hydroxide with hydrofluoric acid.

Yttrium(III) fluoride crystallizes in the orthorhombic crystal system, with space group Pnma (space group no.

[5] Yttrium is nine times coordinated by fluorine atoms.

Conditions/substances to avoid are: acids, active metals and moisture.