File:Nephrite jade (fluvial clast from the Susitna River near Talkeetna, Alaska, USA) 7 (48162872776).jpg

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(~11.5 centimeters across at its widest)

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

Some famous localities for nephrite jade in North America include Wyoming, California, British Columbia, and Alaska. The rock seen here is Alaskan nephrite jade. It has been eroded from glacial drift deposits in the Alaska Range and transported downstream in modern rivers.

Locality: fluvial gravel clast, Susitna River, unrecorded/undisclosed site at or near the town of Talkeetna, south of the Alaska Range, southern Alaska, USA
Date
Source Nephrite jade (fluvial clast from the Susitna River near Talkeetna, Alaska, USA) 7
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@N05/48162872776 (archive). It was reviewed on 30 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

30 November 2019

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current16:54, 30 November 2019Thumbnail for version as of 16:54, 30 November 20192,999 × 1,987 (5.04 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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