Yuksporite is a rare inosilicate mineral with double width, unbranched chains, and the complicated chemical formula K4(Ca,Na)14Sr2Mn(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3.

[3] It was first reported in 1922, from nepheline syenite occurrences in the Kola Peninsula, Russia, and named by Alexander Fersman for the locality, near Mount Yukspor.

All agree, however, that the refractive indices are Nx = 1.644 and Nz = 1.660 (with Ny unspecified), which are larger than those for quartz, but similar to those for tourmaline.

At the Khibiny massif it occurs in veins in nepheline syenite associated with titanite, pectolite, astrophyllite, biotite and aegirine.

[7] At the Murun Massif in the Sakha Republic it is associated with aegirine, kalsilite, potassic feldspar, titanite, lamprophyllite, wadeite and tausonite.