Bulletin - United States Geological Survey Volume 583

Bulletin - United States Geological Survey Volume 583

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...74, p. 80, 1891. 60. Wolframite from Grube Pfaffenberg, Neudorf, Harz Mountains, Germany. Schneider, R., Ueber die chemische Constitution des Wolfram-Minerals: Jour. prakt. Chemie, vol. 49, p. 334, 1850. 61. Black wolframite from Silver Comet mine, 11 miles west of Pioche, Nev. J. G. Dinwiddle, analyst; personal communication. The analysis also showed Fe203, 2.92; HjO below 110 C, 0.03; H20 above 110 0., 0.57. The FeO of the analysis gave an B. PHOTOMICROGRAPH OF GRANITE FROM WHETSTONE MOUNTAINS, ARIZ. Showing wolframite (black) with warty protuberances of scheelite. X 90. the wolframite series--Continued. 7.51 7.228 7.513 excess of 0.2 and to this has been added 2.6, the equivalent of the Fe203 given. In appearance the material is so pure that it is difficult to account for the apparent presence of 3.3 per cent of scheelite (CaW04). Possibly the "H30 above 110 0., 0.57," should be COa. 62. Wolframite from Cash tin mine, Irish Creek, Rockbridge County, Va. Analysis by J. G. Dinwiddie. The analysis also shows Fe203, 4.03; FeO, 11.56; H20 at 110, 0.12; H20 above 110, 0.63; Ti02, 0.02; A1203, 0.32; C02, 0.5. The Fe203 has been changed to FeO and added to that item. It is extremely difficult to make accurate determinations of ferric and ferrous iron in the wolframites, owing to the likelihood of part of the iron being oxidized during grinding and difficulties inherent in the chemical determination. The change also makes the analysis foot up better. The scheelite (CaW04) is very high, (21.1), but specimens of wolframite from the locality show many inclusions of scheelite. (See PI. XIV.) 63. Wolframite from Neuhaus Stollberg, Stassberg, Harz Mountains, Germany. Analysis by Petzold. Schneider, E., Ueber einen harzer Wolfram: ...show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236805852
  • 9781236805850