Stoneware a vitreous or semi-vitreous ceramic ware of fine texture made primarily from non-refractory fire clay. Description Stoneware's maturation temperature ranges from about 1200 °C to 1315 °C. In essence, it's man-made stone. One widely recognized definition's from the Combined Nomenclature of the European Communities, which states: "Stoneware, which, though dense, impermeable and hard enough to resist scratching by a steel point, differs from porcelain because it's more opaque, a… (More on Stoneware)