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Freaky Flourescent Fossil Shell


In the daylight, this is an articulated Exogyra shell from the Cretaceous New Egypt Formation as it runs through Mullica Hill, New Jersey. I brought it home because it had an interesting bit of vivianite replacement covering half the surface of one valve. When I brought it home, I noticed some white material inside the shell cavity. I figured it might be calcite, which sometimes fluoresces. So, I pulled out my UV lamp. To my shock, not only did the white material glow an interesting powder blue color, but the majority of the one valve glows an intense, bright red! Meanwhile, the other valve doesn't glow at all.

From the album:

Fossil Flourescence

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Photo Information for Freaky Flourescent Fossil Shell

Taken with Canon Canon EOS 40D

  • 42 mm
  • 10/1
  • f f/16.0
  • ISO 125
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30 minutes ago, caldigger said:

I belive Aragonite has a red fluorescence.

Nope, yellow. I was expecting that bit of white I saw in daylight to glow either orange or yellow, but it turned out not to fluoresce at all. Also, there is almost not aragonite left in the shell. It's all been replaced by something or re-arranged into more stable CaCO2 minerals. 

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