The Nasiconss, Na1+XZr2SiXP3Xo12 O<X<3, includes some of the best solid state sodium conductors known today. Compositions in the interval 1.6<X<2.6 show conductivities comparable to the best aβ-alumina ceramics. It is well known that the ion conductivity of 8-alumina is strongly dependent on the texture of the ceramic. Here a similar behaviour is reported for Nasicon ceramics. Ceramics of the bulk composition Na2.94 Zr1.49Si2. 20P0.80O10.85 were prepared by a gel method. The final ceramics consist of Nasicon crystals with X=2.14 and a glass phase. The grain size and texture of the ceramics were controlled by varying the thermal history of the gel based raw materials and the sintering conditions. The room temperature resistivity of the resulting ceramics varies from 3.65 103 ohm cm to 1.23 10 ohm cm. Using the temperature comparison method and estimates of the area of grain boundaries in the ceramics, the resistivity of the Nasicon phase is estimated to be 225 ohm cm at 25°C. B203 - or Al2O3 -doping of the glass bearing Nasicon ceramic lower the room temperature resistivity by a factor 2 to 5. The dopants do not substitute into the Nasicon phase in substantial amounts.