Ceramic Raw Materials
This chapter is mostly about pottery. Pottery is only one of the large number of products known as ceramics. Other ceramics are covered briefly. Although pottery is composed of predominantly crystalline phases, glass (including glaze) is not. Glasses (including obsidian) are formed from the solidification of molten silicate — solidification that took place too rapidly for minerals to crystallize. Terracottas are thick, coarse, porous wares normally fired well below 900°C. Porcelain is a ternary mixture of clay, quartz, and feldspar. The latter acts as a flux that aids in the development of a glassy phase in the fired product.
KeywordsQuartz Silicate Cobalt Manganese Shrinkage
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