Geology of the Titanium and Apatite Deposits of Virginia Volume 3

Geology of the Titanium and Apatite Deposits of Virginia Volume 3

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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. 1913 edition. Excerpt: ...idea of the composition of the rocks, more especially the range in the important constituents, Ti02, Fe208, FeO, CaO, and P205. The variations of these and of several of the important lesser constituents are best shown by comparing their molecular proportions graphically in the diagram, fig. 10, which is constructed from the analyses in table, page 147, by plotting the molecular proportions of the oxides as ordinates, taking those of titania as abscissas. Fig. 10.--Diagram showing variation in the molecular constituents of eight nelsonites from Nelson County, Virginia. Detailed study of the diagram shows irregularity in the variations of the principal oxides, especially FeO and Fe203. The lines representing the molecular proportions of these two oxides are antagonistic, except in the right half of the diagram both decrease but not to the same extent. Fe203 shows a general tendency to decrease with increasing Ti02 but it is marked by great irregularity. This irregularity in FeO and Fe20, when compared with Ti02 accords with the variable proportions of the minerals rutile, ilmenite, and magnetite present in the rocks. Of these minerals, those rocks represented on the left of the table contain magnetite and ilmenite, while tho.e on the right contain chiefly rutile with minor ilmenite. There is closer correspondence, however, between the lines representing the molecular proportions of CaO, P208, and F in the mineral apatite, but are antagonistic to those of FeO and Fe208, which emphasizes irregularity in the ratio of the principal minerals composing the rocks, apatite to the dark iron and titanium-bearing minerals, magnetite, ilmenite, and rutile. Such irregular variations are noted not only in closely related rocks but in different parts of the same...
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Product details

  • Paperback | 126 pages
  • 189 x 246 x 7mm | 240g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236538676
  • 9781236538673