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Practical Mineralogy Simplified; For Mining Students, Miners and Prospectors

Practical Mineralogy Simplified; For Mining Students, Miners and Prospectors


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Chapter III COPPER ORES There are a great many copper ores, and they are scattered far and wide over the face of the earth. However, the number of localities where copper is mined with profit is not great. Not all of the copper minerals are considered as ores, and only the most important economic minerals will be here considered. Most copper ores, like the ores of other metallic elements, have a certain place in the vein formation or deposits, and also have certain definite properties that distinguish them from other ores as a group. Generally speaking, the copper ores are not very hard, all being scratched by a knife. Most of them have a specific gravity above 3. This is not true of all, but it is true of the first-class ores, and is true of a great majority of the ores that will be discussed here. All of the ores will give a green-colored flame when the mineral is scraped off by a knife into a candle or alcohol-lamp flame. They are practically all soluble in nitric acid, giving a green color to the solution; if ammonia be added, a blue color will be the result. Sometimes a considerable amount of ammonia has to be added, and then only a faint blue is detected; this is, of course, true only of minerals containing a small amount of copper. The oresthat will be studied all yield a deep blue after ammonia is added to the nitric-acid solution. A test of this kind is easily made, provided one has the acid and ammonia handy; but for most of the copper minerals, the flame color is sufficient. Native Copper.?This mineral or native element is found in many localities in small amounts, and in a few places in large enough quantities to be of commercial value. It is found as crystal forms, as wire copper, also tree-like, massive, and as sand. It has a copper-red color, metallic lustre, ..


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Product Details
  • ISBN-13: 9780217034272
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217034276
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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