Science Progress Volume 1, Pp. 177-364

Science Progress Volume 1, Pp. 177-364

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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. 1906 edition. Excerpt: ...for these are matters of entirely subsidiary importance. Nor is this the place to describe the nomenclature to be employed to express the degree of crystallisation, the size of the crystals, and the character of their development; but I may say that the terms selected appear to be well chosen, and might be conveniently adopted, whatever may be the fate of the quantitative classification itself. The principles of the classification will, however, be more easily understood when they are applied to a particular rock, such as the microgranite already referred to. As a result of the calculations that have been made, it will be seen that the gravimetric proportion of salic to femic minerals in the norm or ideal mineral composition of this rock is 95 25 to 373, which is more than 7 to 1. The rock is therefore a persalane. The quartz in the norm amounts to 3176 per cent, and the felspars to 6271, which is less than three-fifths and more than one-seventh. The rock, therefore, belongs to the quardofelic order of the persalane class--an order which, as already stated, has received the name of Britannare. The proportion of the molecules of the alkalies, which are in this case all salic, to those of the salic lime is mo to 98, which is more than 7 to 1. The rock is therefore peralkalic, and belongs to the Liparase rang of the order. Again, the proportion of the potash to the soda molecules is 537 to 573, which is less than 5 to 3 and more than 3 to 5. This places the rock in the sodipotassic sub-rang, which is known as Liparose. The calculation of the norm seems long and complicated, but it can, with practice and the help of the tables included in 1 In the last two classes the matter becomes more complicated. For instance, Marquettose is the domagnesic...show more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236563034
  • 9781236563033