Contributions from the Geological Department of Columbia University Volume 23

Contributions from the Geological Department of Columbia University Volume 23

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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. 1912 edition. Excerpt: ...and as inclusions in quartz. _. Largest grains.024" diameter. Not much mineral dust. The degree of rounding is variable; there are sharp and nearly spherical grains. The limonite content is slightly above average. A few micropcrthite grains were noticed' Feldspars are only slightly decomposed. Th f '. " ere area ew grains O24 diameter. Mineral flour is abundant. Both angular and well-rounded grains are common. The limonite content is average. Plant fragments are present. Practically all the sample passes through the 100-mesh sieve. The shape of grain varies from sharp to nearly spherical' Limonite content below average. Microperthite grains were seen' The quartz has more liquid and gas inclusions than usual. Diameter of largest grains.024." Some grains are well rounded. Limonite Largest grains.024 diameter. Largest grains.032" diameter. Quartz Gamet Orthoclase Plagioclase Diopside Enstatite Microcline Homblende I Quartz Hypersthene Garnet Diopside Plagioclase Orthoclase Microcline Homblende Enstatite Quartz Garnet Diopside Hypersthene Orthoclase Well-rounded and angular grains are common. Limonite content below average. The garnet varies in color from colorless to deep pink.. Magnetite. Serpentine. Kaolinite. Sericite. Apatite l6. Hematite Some are nearly spherical in shape, while others are angular. The limonite content is average. Microperthite grains are common. Magnetite, apatite and rutile are mostly inclusions 11. Microcline. 15. Chlorite 12. Magnetite 16. Apatite 13. Kaolinite 17. Rutile 14. Sericite Largest grains.032" diameter. The larger grains are nearly all travel rounded. Limonite content below average. Microperthite is present. Liquid and gas inclusions are abundant in the quartz. The feldspars...
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Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • United States
  • English
  • black & white illustrations
  • 1236990064
  • 9781236990068