Raw Materials Dictionary Ceramics Glaze Making Clay
The raw materials are silica sand, soda, calcite, dolomite (raw material of calcium carbonate and magnesium carbonate), and feldspars (raw materials in form of fine sand). Aluminium trihydrate, sodium sulphate, chromite, coal, etc. are used as auxiliary raw materials which are used as dyes and clarifiers of the melt (Fig. 1). Fig. 1.SILICA SiO2 (m.p. 3119oF 1715oC) is second only to clay in significance as a ceramic material, and it is the most abundant mineral in the earth’s crust. The principal siliceous materials are Crystalline Quartz, Quartzite, Sandstone, Silica Sand, “Organic” and Amorphous Silica including Flint and Diatomaceous Earth.