Nebraska fluorescent minerals

      The specimens shown at right are from Crawford, Nebraska.  The specimens are calcite and chalcedony and have a white to tan color in normal light.   The specimens in  the middle column are exposed to long wave ultraviolet light.  For the most part the dark and light purple colors are due to reflection of the light off the minerals in the specimen.   If you will notice there does seem to be a couple small area of white showing which I believe is long wave fluorescence.   The photos at the far right show a strong green (chalcedony)  and red/pink (calcite) fluorescence under short wave ultraviolet light.

Regular lighting

Regular lighting

Long wave ultraviolet light

Long wave ultraviolet light

Short wave ultraviolet light

Short wave ultraviolet light