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File:Annual report of the United States Geological Survey to the Secretary of the Interior (1895) (14758435486).jpg

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Identifier: annualreportofun1711geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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PLATE XLIII 17 GEOL, PT I 48 753 PLATE XLIII. A. Soda-8yenite-porphyry, No. 46 Tuolumne, showing the microcrystalline ground- mass of albite grains in which are embedded phenocrysts of plagioclase. Withthe analyzer, X 50. B. A view of another portion of the same section as the previous, showing radiating brushes of delicate blue hornblende needles. Without the analyzer, X 50.754
Text Appearing After Image:
PLATE XLIV. PLATE XLIV. A. Diorite-porphyry, No. 298 S. N., showing the idiomorphic tendency of the plagio- clase and hornblende. With the analyzer, X 45. P = plagioclase phenocrystswith decomposed interior and rim of fresh feldspar; A = brown hornblende.The smaller plagioclases of the grouudmass likewise have idiomorphic ten-dency, so that the rock has a nearly panidiomorphic structure. B. Quartz-diorite-porphyry, No. 298 S. N., view of part of the same section as the previous, the section being made from a chip taken at the contact of the twodikes. The microcrystalline nature of the quartz-feldspar groundmass isshown, and in this groundmass are embedded plagioclase phenocrysts. Withthe analyzer, X 45.756 U. S. GEOLOGICAL SURVEY SEVENTEENTH ANNUAL REPORT PART I PL. XUV

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Author Geological Survey (U.S.)
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Volume
InfoField
1895
Flickr tags
InfoField
  • bookid:annualreportofun1711geol
  • bookyear:1880
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Geological_Survey__U_S__
  • booksubject:Geological_Survey__U_S__
  • booksubject:Geology
  • booksubject:Water_supply
  • booksubject:Forest_reserves
  • booksubject:Mines_and_mineral_resources
  • bookpublisher:Washington___G_P_O_
  • bookcontributor:University_of_Illinois_Urbana_Champaign
  • booksponsor:University_of_Illinois_Urbana_Champaign
  • bookleafnumber:866
  • bookcollection:university_of_illinois_urbana-champaign
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
30 July 2014
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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14758435486. It was reviewed on 9 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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