This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionNephrite jade (Precambrian; Rawlins area, Wyoming, USA) (24670081006).jpg
Nephrite jade with weathering rind from the Precambrian of Wyoming, USA. (DMNH 8583, Denver Museum of Nature & Science, Denver, Colorado, 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.
Age: Precambrian (probably Proterozoic)
Locality: unrecorded locality at or near Rawlins, central Wyoming, USA
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.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue