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Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. [2] [3]
In the Ancient Near East, clay tablets (Akkadian ṭuppu(m) 𒁾) [1] were used as a writing medium, especially for writing in cuneiform, throughout the Bronze Age and well into the Iron Age. Cuneiform characters were imprinted on a wet clay tablet with a stylus often made of reed ( reed pen ).
Clay minerals are hydrous aluminium phyllosilicates (e.g. kaolin, Al 2 Si 2 O 5 4), sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations found on or near some planetary surfaces.
A link exists between 6,000-year-old engravings on cylindrical seals used on clay tablets and ... when they studied the engravings of cylinder seals invented in Uruk in 4400 BC and used to imprint ...
Plasticine was invented in 1897 by William Harbutt of Bathampton, England. ... Polymer clay is a modelling material that cures when heated from 129 to 135 °C ...
Another available alloy, EZ960 Sterling Silver Metal Clay was invented by Bill Struve from Metal Adventures, the inventor of BRONZclay™ and COPPRclay™. Because the clay is a sterling silver alloy, one of its best attributes is its post firing strength, in comparison to fine silver.
The "clay body" is also called the "paste" or the "fabric", which consists of 2 things, the "clay matrix" – composed of grains of less than 0.02 mm grains which can be seen using the high-powered microscopes or a scanning electron microscope, and the "clay inclusions" – which are larger grains of clay and could be seen with the naked eye or ...
During the copper age, the ancient Chinese invented fired bricks as early as 4400BC. In Chengtoushan, fired bricks were used as flooring for houses. [16] Clay was also used as sewer pipes by the Mesopotamians at around 4000 BC, with the earliest examples found in the Temple of Bel in Babylonia.