File:Gneiss (Cranberry Gneiss, Mesoproterozoic, 1.05 Ga; Appalachian Mountains, eastern USA) (49156274056).jpg

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Gneiss from the Precambrian of eastern USA. (public display, North Carolina Museum of Natural Sciences, Rayleigh, North Carolina, USA)

Gneiss is a high-grade, foliated metamorphic rock. It forms principally by metamorphism of schist, granite, or granite-like rocks. The foliation in gneiss is obvious and consists of alternating bands of light and dark minerals. The light-colored component is usually quartz (SiO2).

Geologic unit: Cranberry Gneiss, late Mesoproterozoic, 1.05 Ga

Locality: unrecorded/undisclosed site in the Appalachian Mountains of eastern USA (possibly North Carolina)
Date
Source Gneiss (Cranberry Gneiss, Mesoproterozoic, 1.05 Ga; Appalachian Mountains, eastern USA)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49156274056. It was reviewed on 2 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 December 2019

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Date/TimeThumbnailDimensionsUserComment
current06:22, 2 December 2019Thumbnail for version as of 06:22, 2 December 20193,210 × 2,685 (7.41 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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