File:Nephrite jade ventifact (Precambrian; Granite Mountains, Wyoming, USA) 8.jpg

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English: Nephrite jade ventifact from the Precambrian of Wyoming, USA.

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.

The greenish-black nephrite jade sample seen here has a lustrous polish and curved facets that formed from natural abrasion by winds. Any rock that has natural wind polish is called a ventifact.

Age: Precambrian (probably Proterozoic)

Locality: undisclosed locality in the Granite Mountains, central Wyoming, USA
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Source https://www.flickr.com/photos/47445767@N05/24401127630/
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@N05/24401127630 (archive). It was reviewed on 24 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

24 December 2019

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