Utah fluorescent minerals

      The specimens shown at right are dinosaur bone from the Yellow Cat area of Utah. The bone is from the Jurassic and is 146 to 195 million years old.  The specimens are a white to light tan or brown in normal light.   The specimens are reflecting the ultraviolet lights in the purple areas of both the long and short wave light photos.  The yellow color fluoresces stronger under the long wave light than the short wave light.  The yellow fluorescing mineral is possibly uranium.  Uranium fluoresces yellow under both long and short wave and is known to be found in the Yellow Cat area.

Regular lighting

Regular lighting

Long wave ultraviolet light

Long wave ultraviolet light

Short wave ultraviolet light

Short wave ultraviolet light