File:Orthogneiss 03mw2622.jpg

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Description
English: Bedrock sample from a UGSG drill core at Western Cape Cod, Massachusetts. An orthogneiss with a composition of plagioclase (40%), K-feldspar (25%), quartz (25%), chlorite (5%), muscovite (2%), epidote (2%), and trace sphene and oxides, sample 03MW2622 shows less evidence of metamorphism than most of the other gneissic samples. 8-mm plagioclase porphyroclasts are visible in hand sample. Micas occur in 0.5-1 mm-thick bundles, yet no deformational fabrics are recognized.
Source http://pubs.usgs.gov/of/2003/of03-221/htmldocs/bedrock_photos/03mw2622.htm
Author B.W. Hallett, V. F. Paskevich, L.J. Poppe, S.G. Brand, and D.S. Blackwood

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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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current09:15, 27 May 2010Thumbnail for version as of 09:15, 27 May 20102,013 × 1,755 (624 KB)Woudloper (talk | contribs){{Information |Description={{en|1=Bedrock sample from a UGSG drill core at Western Cape Cod, Massachusetts. An orthogneiss with a composition of plagioclase (40%), K-feldspar (25%), quartz (25%), chlorite (5%), muscovite (2%), epidote (2%), and trace sph

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