The Variations and Ecological Distribution of the Snails of the Genus IO

The Variations and Ecological Distribution of the Snails of the Genus IO

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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. 1915 edition. Excerpt: ...though stones therefrom were then being sold at Cairo and Suez and the region had been previously visited by Europeans in search of its product. TIBET. No geologic information is available concerning the occurrence of turquois in Tibet. The extensive use of turquois in that region, however, points to a local supply,4 and scattered through the native literature are references designating Tibetan localities where this mineral has been obtained. Berthold Laufer5 has critically reviewed this subject and from information assembled by him it appears that the following localities are or have been productive: (1) The region between Lhasa and the China-Tibetan border; particularly in the vicinity of Lhasa and near Chamdo, a small town of eastern Tibet, about 400 miles ENE. of Lhasa; (2) Djaya (or Draya), to the west of Bathang; (3) a mine of the Gangs-chan mountains of Ngari-Khorsum in western Tibet; and (4) several mountains of the great State of Derge in eastern Tibet.6 As to further details regarding these occurrences, few can be given.7 The first mentioned locality is probably the most important. The third, also, is stated to have yielded good material. Most of the Tibetan turquois seen by the writer has been matrix material, in which turquois of greenish to bluish color occurs in rounded areas within a dark, iron-colored rock, the whole presenting a mottled appearance when polished. Material of such appearance has recently come into the London and Paris markets in some abundance. CHINA. Little is known of the occurrence of turquois in China, as no geologist has visited its localities in that country. Rockhill,8 who passed through Si-ngan in 1889, was informed that turquois is found in the Honan Province. Berthold Laufer,9 who visited the region in...
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Product details

  • Paperback | 180 pages
  • 189 x 246 x 10mm | 331g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236623886
  • 9781236623881