Pocket Geologist and Book of Minerals; Elements, Minerals, Rocks, Veins, Metals, Ores, Carbons, Gems, Spars, Limes, Clays, Grits, Salts, Paints

Pocket Geologist and Book of Minerals; Elements, Minerals, Rocks, Veins, Metals, Ores, Carbons, Gems, Spars, Limes, Clays, Grits, Salts, Paints

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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. 1877 edition. Excerpt: ...but by remembering that mica is in bunches of sheets, that ircn pyrite is hard and angular and brittle, that copper pyrite is soft and brittle and cuts into powder, but that gold is not in bunches of sheets, is not sharp cornered nor brittle and hammers out flat, can be cut into threads without crumbling, mistakes will be avoided, especially when note is taken of the great weight of gold when compared with the substances mentioned. There are three great gold belts that cross the United States from North to South: 'The Western or Pacific belt reaches from British Columbia on the north down through Washington, Oregon and California to Mexican California, and passes along the line of the Sierra Nevada upheaval, principally on the western slopes. Like all other gold belts it outcrops through the primary rocks, principally the slates, in veins both sulphide and quartzose in character, and from these veins in theokkr rocks the gold has been washed down and disseminated in all sorts of secondary deposits. The great "Mother Lode" of California is perhaps the biggest vein in the world. It has been traced and worked for over sixty miles, and bears an average width of 40 feet of quartz; very many smaller veins run along with it in directions almost parallel, these smaller veins generally carrying richer quartz than the Mother Lode, and there are generally one or two veins or sheets of talcose slate very rich in fine gold running along with it, The country rock is greenstone with porphyritic features. From this Mother Lode and the other veins of California, and from the derived wash gold deposits of that State, nearly one-half of the present annual gold supply of the world is obtained. The central gold belt outcrops on the line of upheaval...show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236774744
  • 9781236774743