The Nomenclature of Petrology; With References to Selected Literature

The Nomenclature of Petrology; With References to Selected Literature

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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. 1920 edition. Excerpt: ...Assynt.) S. T. Shand: Trans. Edin. Geol. Soc., ix, 1910, p. 384. Leeuwfonteinite, Molengraaff, 1904.--A variety of alkali-syenite containing barkevikite, and characterised by an abundance of anorthoclase. Porphyritic varieties also occur. (Leeuwfontein, Bushveld.) H. A. Brouwer: Journ. Geol., xxv, 1917, p. 775. Leidleite, Thomas & Bailey, 1915.--A porphyritic rock containing phenocrysts of plagioclase (labradorite to anorthite) in a subviarolitic groundmass of felspar, augite, and glass. (Glen Leidle, Mull.) E. M. Anderson & E. G. Radley: Q.J.G.S., 1xxi, 1915, p. 205. Lemberg's Reaction.--A test for the discrimination of calcite and dolomite. Lemberg's Solution, logwood digested in an aqueous solution of aluminium chloride, is used as a combined stain and reagent. Calcite (and aragonite) are stained violet after treatment for about ten minutes, while dolomite 'remains unchanged. Lenne Porphyry, v. Dechen.--A group name for the keratophyres and associated crystal-tuffs of the Lenne Valley, Westphalia. Leopardite, Hunter, 1853.--A variety of quartzporphyry containing small phenocrysts of quartz in a microgranitic or microgranophyric groundmass of quartz, orthoclase, albite, and mica. The rock has a characteristically spotted or streaked appearance due to staining by hydroxides of iron and manganese. T. L. Watson: Journ. Geol., xii, 1904, p. 215. Lepidoblastic, Becke, 1903.--A metamorphic texture due to the development during recrystallisation of minerals such as micas and chlorite having a flaky or scaly habit. Leptite, Hummel, 1870.--A term, used especially by Swedish and Finnish geologists, applied to finegrained granular metamorphic rocks composed mainly of quartz and felspar with subordinate mafic minerals;= Granulite, = Halle more

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  • Paperback | 86 pages
  • 189 x 246 x 5mm | 168g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236560434
  • 9781236560438