The wollastonite crystalline glaze is produced by heating a mixture of glass powder, natural quartz, orthoclase, kaoline and calcite. Crystal phase of glaze, belonging to low-temperature triclinic wollastonite, was determined by such means as X-ray powder diffraction, polarized microscope and electron microprobe analysis. The unit cell parameters are ao=7.926 A, bo=7.129 A, c0=7.051A, a=90º3΄,β=95º 12΄,´γ=103º 45΄.