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Deep under the sea... aragonite

This banded aragonite has formed on the sea-floor by compression of all kind of small skeletons and shells of living creatures. Photo in SW UV

Locality: Millau, Aveyron, Midi-Pyrénées, France.

As the second photo shows, the creatures may very well fluoresce during their lifetime too. Living coral, fluorescing under LW-UV

Locatlity: Maui Ocean Center at Malaea, Maui, Hawaii, USA (2013).

The bands actually show tide ripples

No tripod... shot from the hip. Even alive, these corals fluoresce. They do so to protect themselves from the UV-light from te sun.

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