Ga+-beta "-alumina and GaZr2(PO4)(3) have been prepared by ion exchange techniques from Na+-/beta "-alumina and AgZr2(PO4)(3), respectively. The structures of both compounds at room temperature are reported along with that for beta "-alumina at 11 K. The coordination chemistries of the Ga(I) cations in the two materials are distinctly different : in Ga+-beta "-alumina, the Ga(I) cation displays 3+0-coordination, indicative of a stereochemically active lone pair, with a minimum Ga-O distance of 2.39 Angstrom, but in GaZr2(PO4)(3), Ga(I) is 6-coordinate with a minimum Ga-O distance of 2.80 Angstrom. Both Ga+-beta "-alumina and GaZr2(PO4)(3) are stable toward oxidation in air up to similar to 500 degrees C. Crystal data are as follows. Ga-1.6[(Al10.7Li0.3)O-17] : rhombohedral, R(3) over barm$, Z = 3; for T = 296 K, a = 5.5951(1) Angstrom and c = 34.3670(8) Angstrom; for T = 11 K, a = 5.5900(1) Angstrom and c = 34.3805(8) Angstrom. GaZr2(PO4)(3) : rhombohedral, R(3) over barc$, Z = 6, a = 8.72198(4) Angstrom, c = 23.8820(2) Angstrom.