File:Green orthoclase (Precambrian; Southern Cross, about 11 to 12 km north of Broken Hill, far-western New South Wales, southeastern Australia) (15120707951).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(3,008 × 2,000 pixels, file size: 2.62 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

Green orthoclase feldspar (field of view ~9 cm across) from Southern Cross, ~11-12 km N of the city of Broken Hill, Broken Hill Block, far-western New South Wales, southeastern Australia.

Greenish-colored potassium feldspar is uncommon, but specimens are readily available in the mineral trade. The traditional variety of green feldspar is amazonite, a greenish microcline feldspar. Green orthoclase feldspar is exceedingly rare, and is known from few localities on Earth. Some may be tempted to call this stuff amazonite, but it isn’t. Amazonite only refers to (it’s supposed to refer to) green microcline. Orthoclase feldspar is KAlSi3O8 (potassium aluminosilicate), an abundant rock-forming mineral and a polymorph of microcline (also KAlSi3O8). Published chemical analysis indicates that the green coloration is due to lead impurity.

Here’s a large mass of Precambrian-aged green orthoclase feldspar, from what is traditionally the only known occurrence in the world. This is from the Broken Hill Block of western New South Wales in Australia.
Date
Source Green orthoclase (Precambrian; Southern Cross, about 11 to 12 km north of Broken Hill, far-western New South Wales, southeastern Australia)
Author James St. John

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15120707951 (archive). It was reviewed on 16 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

16 November 2018

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current12:41, 16 November 2018Thumbnail for version as of 12:41, 16 November 20183,008 × 2,000 (2.62 MB)NMaia (talk | contribs)Transferred from Flickr via #flickr2commons

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Green_orthoclase_(Precambrian;_Southern_Cross,_about_11_to_12_km_north_of_Broken_Hill,_far-western_New_South_Wales,_southeastern_Australia)_(15120707951).jpg&oldid=719674311"