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The fluorescent minerals in the specimen are chalcedony and calcite (in some specimens) from the Badlands of South Dakota.
The first image was taken under a short wave ultraviolet light. The chalcedony fluoresces various shades of green. Any calcite present will fluoresce pink to pinkish-red. Any purple areas are the reflection of the short wave light off the normally light tan to grey non-fluorescing minerals of the specimen.
The second image below was taken under long wave ultraviolet light. The shades of purple color are due to the long wave light reflecting off the light colored minerals in the specimen which do not fluorescence under long wave.
For other images of this mineral, go back to the main fluorescent page and click on the view specimen material from South Dakota link.
Sponge - fossil
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Quantity in Basket:
None
Code: SDS-103
Price: $40.00
Shipping Weight: 3.18 pounds
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Time: Oligocene, 37.5-26 million years ago.
Location: Badlands of South Dakota
Minerals: Chalcedony and Calcite
Size: 4-3/4" x 3-1/2" x 4"
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