File:Nephrite jade (Precambrian) (Granite Mountains, Fremont County, Wyoming, USA) 4 (49711539802).jpg

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Nephrite jade from the Precambrian of Wyoming, USA. (cut & polished surface; ~14.1 centimeters across at its widest)

Nephrite jade (nephritite) is a crystalline-textured to felted-textured metamorphic rock principally composed of one or more amphibole minerals (tremolite to actinolite, Ca2Mg5Si8O22(OH)2 to Ca2(Mg,Fe)5Si8O22(OH)2).

Nephrite jade was discovered in Wyoming in the 1930s, resulting in a "jade rush" that lasted for several decades. Most recovered material is alluvial jade, produced by paleoerosion of jade outcrops. Eroded clasts of jade were transported downstream and subsequently buried with other poorly-sorted sediments. Some Wyoming jade has been collected from in-situ outcrops.

This sample is "lode jade" and comes from a "vein" in granite.

Age: Precambrian (probably Proterozoic)

Locality: undisclosed site in the Granite Mountains, Fremont County, Wyoming, USA
Date
Source Nephrite jade (Precambrian) (Granite Mountains, Fremont County, Wyoming, USA) 4
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@N05/49711539802. It was reviewed on 14 April 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

14 April 2020

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current18:10, 14 April 2020Thumbnail for version as of 18:10, 14 April 20203,753 × 1,787 (7.72 MB)Poldavia (talk | contribs)Transferred from Flickr via #flickr2commons

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