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Douglas W. Fuerstenau is P. Malozemoff Professor Emeritus of Mineral Engineering in the Dept. of Materials Science and Engineering, University of California, Berkeley. His career of nearly seven decades started at the South Dakota School of Mines and Technology, where he received his B.S. in Metallurgical Engineering in 1949, followed by an M.S. from the Montana School of Mines in 1950, and ...

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The glass industry was introduced from Venice in the 13th century and soon attained a vast importance; the factories are in the neighbourhood of the mountains, where minerals, and especially silica and fuel, are plentiful. The finest product, the crystal-glass, is made round Haida and Steinschönau.

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Just as land plants depend on minerals in the soil for their growth, every marine plant, even the smallest, is dependent upon the nutrient salts or minerals in the sea water. Diatoms must have silica, the element of which their fragile shells are fashioned. For these and all other microplants, phosphorus is an indispensable mineral.

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Brazil nuts (Bertholletia excelsa castania, castanheiro do para, para-nut, creamnut, castana- de-para, castana-de-Brazil). These nuts are a great source of selenium, which improves the condition of the hair and nails, and boosts skin elasticity.Selenium also wards off opportunistic infections, keeps the muscles in the heart healthy and even helps with acne.

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Archaeological Chemistry [PDF] [21cdot89q2f0]

Other minerals, such as clays and sand, have been and still are used for making artificial (synthetic), human-made materials: clays for making pottery and sand for making glass. Table 4 lists minerals and mineraloids that, because of some specific property, have been used for many millennia for some specific applications. 1.3. ROCK AND STONE

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Gold and Zinc.-When present in small quantities zinc renders gold TABLE II.-Gold brittle, but it may be added to gold in larger quantities without destroying the ductility of the precious metal; Peligot proved that a triple alloy of gold, copper and zinc, which contains 5.8% of the lastnamed, is perfectly ductile. The alloy of II parts gold and i part of zinc is, however, stated to be brittle.

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