modeling clay gres on a white background cutout chamotte
"Stoneware, which, though dense, impermeable and hard enough to resist scratching by a steel point, differs from porcelain because it is more opaque, and normally only partially vitrified. It may be vitreous or semi-vitreous. It is usually coloured grey or brownish because of impurities in the clay used for its manufacture, and is normally glazed." The key raw material in stoneware is either naturally occurring stoneware clay or non-refractory fire clay. The mineral kaolinite is present but disordered, and although mica and quartz are present their particle size is very small. Stoneware clay is often accompanied by impurities such as iron or carbon, giving it a "dirty" look, and its plasticity can vary widely.[5] Non-refractory fire clay may be another key raw material. Fire clays are generally considered refractory, because they withstand very high temperatures before melting or crumbling. Refractory fire clays have a high concentration of kaolinite, with lesser amounts of mica and quartz. Non-refractory fire clays, however, have larger amounts of mica and feldspar.[6] Formulations for stoneware vary considerably, although the vast majority will conform to: plastic fire clays, 0 to 100 percent; ball clays, 0 to 15 percent; quartz, 0 to 30 percent; feldspar and chamotte, 0 to 15 percent.
Size: 2616px × 2578px
Photo credit: © Theo Alers / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: alumina., artist, baked, bodies., ceramic, ceramics, ceramist, chamotte, chippings., clay, clays, coarser, cotta, create, density., distribution, earthenware, fire, firesand, firing, generally, grinding, grog, high, manufacturers, material., materials, materials., minerals, mixed, paper, particle, percentage, pitchers., porcelain., porous, portrait, potery, pottery, powder, prepare, process, produced, raw, screening, selected, silica, size, sizes., specific, stoneware, substances, temperature, temperatures, terra, water-based
