This is an example of Salina Blue. It’s a beautiful blue to a gray-colored form of chalcedony that is translucent but not transparent. The blue coloration varies and seems to change from blue to gray depending on the light source.
The material is great for knapping and from time to time tools and arrowheads made from it can be seen in the Salina, Utah area. Note: It is illegal to pick up tools and arrowheads from public lands.
Salina Blue is most often found as a brecciated limestone however small pieces of blue chalcedony alone may also be found in the area. This beautiful and unique material was likely formed due to the seismic and volcanic activity that occurred in the area long ago.
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It can be found on the surface in several locations in the hills around Salina, Aurora, and Redmond in Central Utah.