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In contrast, earthenware is fired at lower temperatures and is not impervious to liquids. Porcelain, a type of stoneware developed in China, is distinguished by the type of clay used, kaolin, resulting in a pure white color. Kaolin, or China Clay, which occurs in various parts of the world, is often 95% free of impurities. It is also fired to a vitreous state, transforming the constituent silica to glass. Some porcelains bodies are translucent after firing. Firing a piece of pottery to too high a temperature will result in warping or melting. Vitreous clay bodies can be made at different temperatures ranges, but they are typically fired in the stoneware/porcelain range. Fired stoneware absorbs up to 5% moisture, porcelain up to 3%, and earthenware up to 10%. Earthenware, when moist, is typically not freeze resitant.

Clay refers to minerals of a plasticContinuum mechanics In physics, plasticity is a property of a material to undergo a non-reversible change of shape in response to an applied force. Plastic deformation occurs under shear stress, as opposed to brittle fractures which occur under normal str quality formed primarily of aluminaAluminium (or aluminum in North American English) is the chemical element in the periodic table with the symbol Al and atomic number 13. A silvery and ductile member of the poor metal group of elements, aluminium is found primarily as the ore bauxite and and silica. Potters refer to combinations of clays mixed with other materials as clay bodies. Different kinds of clay bodies are created by mixing additives, such as sandSand is an example of a class of materials called granular matter. Sand is a naturally occurring, finely divided rock, comprising particles or granules ranging in size from 0. 063 to 2 mm. An individual particle in this range size is termed a sand grain ., fluxes , grogFor the fictional alien species the Grog (or sessile grog , from Larry Niven's Known Space universe, see Thrintun and Tnuctipun. Grog is an alcoholic beverage made with water and rum. The date of its invention varies from 1730 to 1741, but most agree that, temper , flintchalk cliffs, Cape Arkona, Rugen Flint (or flintstone is a hard, sedimentary cryptocrystalline silica rock with a glassy appearance. Flint is usually dark grey, blue, black, or deep brown in colour. It occurs chiefly as nodules and masses in chalks and li, spodumeneSpodumene is a pyroxene mineral consisting of lithium aluminium inosilicate LiAl(SiO) and is a source of lithium. It occurs as colourless to yellowish ( triphane), purplish or lilac ( kunzite), yellowish-green, or emerald-green ( hiddenite) prismatic crys, wollastoniteWollastonite is a calcium meta silicate mineral (CaSiO) that may contain small amounts of aluminium, iron, magnesium, manganese, potassium, and sodium. It is usually white. It forms when impure limestone is subjected to high temperature and pressure somet, or additional silica, to modify natural clays. Natural clays are thereby altered to fire at specific temperatures. Darker clays often contain iron and other metal oxide impurities. The clay used for porcelain and white stoneware clay bodies do not contain these impurities.