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powdered quartz

См. также в других словарях:

  • Islamic pottery — The era of Islamic pottery started around 622. From 633, Muslim armies moved rapidly toward Byzantine, Persia, Mesopotamia, Anatolia, Egypt and later Andalusia. The early history of Islamic pottery remains somewhat obscure and speculative as… …   Wikipedia

  • Biodynamic agriculture — Biodynamic agriculture, a method of organic farming that has its basis in a spiritual world view (anthroposophy, first propounded by Rudolf Steiner), treats farms as unified and individual organisms, [Diver (1999), [http://attra.ncat.org/attra… …   Wikipedia

  • potter's flint — noun : silica in the form of powdered quartz originally made by pulverizing flint pebbles …   Useful english dictionary

  • Silicon dioxide — Silica redirects here. For other uses, see Silica (disambiguation). Silicon dioxide …   Wikipedia

  • History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …   Wikipedia

  • Nefertiti Bust — Bust of Nefertiti The iconic bust of Nefertiti is part of the Egyptian Museum of Berlin collection, currently on display in the Neues Museum. Material limestone and stucco[1] …   Wikipedia

  • manganese processing — Introduction       preparation of the ore for use in various products.       Manganese (Mn) is a hard, silvery white metal with a melting point of 1,244° C (2,271° F). Ordinarily too brittle to be of structural value itself, it is an essential… …   Universalium

  • NASA spin-off — Science and technology in the United States African American contributions Discoveries …   Wikipedia

  • Silicosis — Classification and external resources ICD 10 J62 ICD 9 502 …   Wikipedia

  • Graphite — For other uses, see Graphite (disambiguation). Graphite Graphite specimen General Category Native element mineral …   Wikipedia

  • Turquoise — For other uses, see Turquoise (disambiguation). Turquoise Turquoise (tumble finished) one inch (25 mm) long. This pebble is greenish and therefore low grade General …   Wikipedia

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