Proceedings Volume 7

Proceedings Volume 7

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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. 1903 edition. Excerpt: ...A. B. Frenzel, of Denver. It came from near Nogales, Arizona, and forms layers up to half an inch in thickness. It was enclosed in crystalline calcite, and presumably formed thin layers in this material. The color is reddish chestnut brown; the structure is fibrous. One surface is quite smooth, the other either bears the impressions of calcite crystals or is covered by a well-marked crystalline coating, composed of indistinct crystals of the mineral itself, which, under the microscope, have a beautiful amber color, and are transparent. The specific gravity is 6-176, streak bright orange yellow, powder not so bright. Composition of the fibrous mass: Percent. Va06 19-014 AaA 3842 PbO 52-954 CuO 8-506 ZnO 12-450 Fe30 0-200 MnO Trace H20 2-650 Insoluble 0-350 99 996 There is no phosphoric acid or chlorin. The ratios given by this analysis are as follows: At. Eqaiv. At. Ratio. V 0 10675 20-85 ( 24.19 M As 0 02506 3-34 14 A 04 1 H 0 00297 29-40 29 40 2 45 2 Pb 0-49152 23-76 23 76 1 98 2 Zn 0 10003 13-76)-qa O Cu 0 06796 10-68 5 O 0 19987 124-91 124 91 10 40 10 The atomic ratio is fairly good. A little doubt might be entertained relative to the hydrogen and oxygen, but as the moisture was determined by ignition after having treated it for several hours at 120C, a slight error might easily have been made, and would account for the fraction of an atom in these ratios. I feel entirely justified in rejecting it in both cases, and the ratio becomes the one accepted for this mineral, with the formula RaVaO, R(OH), . Where we have Pb: Zn as 1:1, in which five-twelfths of the zinc have been replaced by copper, or the ratio of Zn: Cu is 7:5. Vol. 7. pp. 151-162. ECONOMY IN MILL WATER. By Jesse Scobey. Read at the Meeting of the Society, December 5, ...
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Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • United States
  • English
  • black & white illustrations
  • 1236489594
  • 9781236489593