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Fire clay in a furnace. Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium (Al 2 O 3 ·2SiO 2 ·2H 2 O) with or without free silica." [1]
Shell money is a medium of exchange similar to coin money and other forms of commodity money, and was once commonly used in many parts of the world. [1] Shell money usually consisted of whole or partial sea shells, often worked into beads or otherwise shaped.
All fired ceramic wares or materials which, when shaped, contain a significant amount of clay. Exceptions are those used for technical, structural or refractory applications. Pottery is also: (1) the art and wares made by potters; (2) a ceramic material (3) a place where pottery wares are made; and (4) the business of the potter.
Others argue that storing of value is just deferral of the exchange, but does not diminish the fact that money is a medium of exchange that can be transported both across space and time. The term "financial capital" is a more general and inclusive term for all liquid instruments, whether or not they are a uniformly recognized tender.
Examples of commodities that have been used as media of exchange include precious metals and stones, grain, animal parts (such as beaver pelts), tobacco, fuel, and others. Sometimes several types of commodity money were used together, with fixed relative values , in various commodity valuation or price system economies.
Kaolin, sometimes referred to as china clay, is a key ingredient in porcelain, which was first used in China around the 7th and 8th centuries. [17] Ball clay: An extremely plastic, fine grained sedimentary clay, which may contain some organic matter. Fire clay: A clay having a slightly lower percentage of fluxes than kaolin, but usually quite ...
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." White Elephant (sometimes called Yankee Swap or Dirty Santa) is a holiday gift exchange where players ...
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