Image Gallery Graded silica 0.2 to 1 mm for industrial applications Graded silica 3 to 5 mm industrial sample Sodium feldspar in lump, granular and micronized forms for ceramics, glass and glaze applications. Silica, feldspar, dolomite and calcium carbonate for ceramic and porcelain glaze formulations. Premium graded silica produced by Alvand Giti Hegmataneh for industrial applications Micronized calcium carbonate mesh 230–2000