The book A Practical Treatise On Mine Engineering was written by author George Clementson Greenwell Here you can read free online of A Practical Treatise On Mine Engineering book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Practical Treatise On Mine Engineering a good or bad book?
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Sometimes, too, 87 the ingredients of granite are very unequally distributed, and, in particular, the feldspar, which is sometimes disposed in large masses, as is sometimes observed in the island of Arran, as well as in the island of Mull. In the latter, the crystals of feldspar are from one to several inches in diameter. China Clay, so largely used for the manufacture of China and white pottery ware, is chiefly procured from Cornwall. It consists of decomposed granite. In some specimens of gra...nite from Arran the mica assumes a crystallised form the breadth of the crystals not exceeding the thirtieth part of an inch. The quartz of granite is generally of a greyish colour ; the feldspar, whitish grey or reddish ; and the mica is sometimes black and sometimes white. Besides the three principal ingredients now mentioned, some varieties of granite contain also schorl (as between Penzance and the Landsend, near the Loggan Rock), hornblende, and garnets. In the granite found at Aberdeen and its vicinity, which, from its appearance, comes under the denomination of grey granite, and which is the description best known here, and which, from the grains of the ingredients of which it is composed being of small size, is called small grained granite, the feldspar and quartz are in the greatest proportion : the quantity of mica is small, and its place is sometimes occupied by small specks of hornblende or schorl.
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