File:Pegmatitic granite (Precambrian; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 2 (26487685125).jpg

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Pegmatitic granite from the Precambrian of Australia. (~9.1 cm across at its widest)

Pegmatitic granite (a.k.a pegmatite) is a very coarsely-crystalline textured granite, formed by cooling of a relatively water-rich magma. The pegmatite shown above is apparently an early Mesoproterozoic intrusion that intrudes metamorphic host rocks such as amphibolite (<a href="https://www.flickr.com/photos/jsjgeology/26393781216">www.flickr.com/photos/jsjgeology/26393781216</a>). This rock has grayish quartz (SiO2), pale yellowish-colored K-feldspar (KAlSi3O8), black schorl tourmaline, and minor amounts of glittery, pale greenish mica (= retrograde fine-grained muscovite mica or sericite?).

Locality: Alexandra Mine (= locality "SN5" of Barnes, 1988 - New South Wales Geological Survey Bulletin 32: 210), 3 kilometers southeast of the town of Silverton & southeast of the confluence of Black Mill Creek and Umberumberka Creek, west-northwest of the city of Broken Hill, Broken Hill Block, far-western New South Wales, southeastern Australia
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Source Pegmatitic granite (Precambrian; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/26487685125 (archive). It was reviewed on 12 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 November 2019

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Date/TimeThumbnailDimensionsUserComment
current04:15, 12 November 2019Thumbnail for version as of 04:15, 12 November 20193,246 × 2,367 (4.5 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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