File:USGS anorthoclase.jpg

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USGS_anorthoclase.jpg ‎(700 × 581 pixels, file size: 399 KB, MIME type: image/jpeg)

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Description
English: Photomicrograph of bostonite of group 9 from dike, 750 feet north of reservoir, Central City; Phenocryst of orthoclase in groundmass of anorthoclase blades, which show marked flow structure. a, anorthoclase, o, orthoclase; h, hole in slide. Plain light. Gilpin County, Colorado. Pre-1950. Figure 13-E, in U.S.Geological Survey
Date
Source http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20Lovering,%20T.S.%20707
Author USGS


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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Date/TimeThumbnailDimensionsUserComment
current19:21, 16 April 2009Thumbnail for version as of 19:21, 16 April 2009700 × 581 (399 KB)Ttzavaras (talk | contribs){{Information |Description={{en|1=Photomicrograph of bostonite of group 9 from dike, 750 feet north of reservoir, Central City; Phenocryst of orthoclase in groundmass of anorthoclase blades, which show marked flow structure. a, anorthoclase, o, orthoclase

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