Abstract: A cordierite crystal-containing glaze for fine ceramics such as cordierite ceramics. The glaze has an oxide composition comprising,______________________________________ SiO.sub.2 66-75 wt. % Al.sub.2 O.sub.3 13-22 MgO 3-8 B.sub.2 O.sub.3 2.5-7 Na.sub.2 O + K.sub.2 O .4-2.0 ______________________________________The above components should comprise at least 95%, and preferably 96-99%, of the total. The glaze can also include 0-2% ZnO and 0.varies.2% ZrO.sub.2. Apart from colorants, the balance, if any, may comprise small amounts of other compatible compounds such as CaO, SrO, BaO, Cs.sub.2 O and F.sub.2, up to a total of 3%; but the ratio of SiO.sub.2 +Al.sub.2 O.sub.3 +MgO to the sum of such other compatible compounds should be at least about 28:1. Fe.sub.2 O.sub.3 and TiO.sub.2, which are generally present as impurities in standard batch raw materials, are not harmful in amounts less than a total of 1.5%; in greater amounts, they begin to alter the color of the glaze. Li.sub.