University of California Publications in Geological Sciences Volume 5

University of California Publications in Geological Sciences Volume 5

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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. 1910 edition. Excerpt: ...the position a as the pole face and. zone be as first meridian. The readings in this position are given in the columns /1' and p. With c as the pole face the transposed angles corresponding to these readings are in columns j1" and p" obtained by means of the two formulae cos. p"--cos. 1' sin. p' and cot. j1"--sin. f1' tan. p. Measured Calculated The new form o (014) occurs as a narrow face lying on both sides of the base and four faces of it were observed. The dome n (203) was observed but once as a very narrow face truncating the edge of (223) (223). Brochantitc.--In measuring what were supposed to be caledonite crystals, it became apparent from the angles that some of the erystals were brochantite. The two minerals are intimately associated, and have the same emerald green color. The crystals are so minute that they had to be handled with a magnifying lens, and it was only by the measurements that the writer could in most eases tell whether he had brochantite or caledonite set up. The habit of the brochantite crystals is in general different from that of the caledonite. The crystals are characteristically in thin plates, tabular to (010) and elongated prismatic and in the direction of the a-axis. Occasional (010) is narrower with a corresponding increase in the width of the prismatic faces, thus giving a more stocky appearance to the crystals. The general habit and common combination of forms is seen in plate 19, fig. 4. The forms occurring on the crystals are: c (001) e (012) 6 (010) i (011) m (110) v (101) r (120) g (041) new Measured Calculated The base was observed on one crystal only and as a mere line face. One face of e is the common terminating form, yet on the crystal having the base both faces occurred more

Product details

  • Paperback | 134 pages
  • 189 x 246 x 7mm | 254g
  • United States
  • English
  • black & white illustrations
  • 1236948572
  • 9781236948571