This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...are very similar to a granite and have sometimes been called "coarse granite" and, if we could conceive of the constituents of a granite magnified a hundred times or more, we would have an appearance that is very similar to a pegmatitic dike. The main mineral constituents of these dikes are quartz, feldspar, and ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...are very similar to a granite and have sometimes been called "coarse granite" and, if we could conceive of the constituents of a granite magnified a hundred times or more, we would have an appearance that is very similar to a pegmatitic dike. The main mineral constituents of these dikes are quartz, feldspar, and muscovite mica in varying proportions, sometimes being nearly equally distributed while in others sometimes one and again another will predominate. Sometimes the feldspar, quartz, and mica have separated out in rather small masses while at other times they have separated out on a larger scale and are more or less crystallized. The associated minerals that occur in these dikes vary with their occurrence and while in some there is a great variety of them, in others they are very rare. The pegmatitic dikes that are observed in North Carolina have furnished the greatest variety of accessory minerals, 45 having been observed from the different veins, at a number of which over 20 dilrerent minerals have been observed. Of these accessory minerals the garnet (either andradite or almandite) is by far the commonest and is often the only accessory mineral observed. The accessory minerals in these pegmatitic dikes are usually well crystallized and a number of them are gem minerals. The following is a list of the minerals that have been identified in the mica-bearing pegmatitic dikes in North Carolina and they are given approximately according to their relative frequency of occurrence: Quartz (massive, crystallized and Zoisite (var. thullte). smoky). Menaroanite. Alblte, Feldspar. Rogersite. 'Joseph Hyde Pratt in "The Southland," Ashevllle, North Carolina, August, 1001, pp. 120-121. Microcline, Feldspar. Oligoclase, Feldspar. Orthoclase, Feld...
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