The mineral industry of Africa includes the mining of various minerals; it produces relatively little of the industrial metals copper, lead, and zinc, but according to one estimate has as a percent of world reserves 40% of gold, 60% of cobalt, and 90% of the world’s platinum group metals.
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The electronic edition is a part of the UNC-CH digitization project, Documenting the American South. The text has been encoded using the recommendations for Level 4 of the TEI in Libraries Guidelines. Original grammar, punctuation, and spelling have been preserved.
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- A rock with different minerals may disintegrate faster due to differential expansion and contraction of minerals. - A well jointed rock will break faster because physical and chemical agents can penetrate faster e.g. by freezing and thawing. - Fine textured rocks have a large surface area on which chemical processes can act e.g. Limestone.
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A rock drawing in Spain from about 7000 B.C. shows a man who has climbed a hillside, found a crevice holding a hive, and is reaching in to grab the honey. Indeed, a lucky wanderer in just about any part of Europe, Africa, or Asia that wasnt covered with ice could stumble on a hive and—at the risk of some stings—come away with a treat.
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Corundum is used as a gemstone, abrasive, refractory and much more. Red corundum is a ruby, blue is a sapphire, any other color is a fancy sapphire. Synthetic corundum is used instead of natural corundum in most applications.
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Some sources are better than others due to the stones appearance, hardness, and other qualities. Therefore, stone may be quarried in China, India, Africa, South America, and some does come from within United States borders. Cost of processing is also a factor.