🔎 UNIDENTIFIED Green under natural light, red under UV light. What is it?

[pepperell]

Found off Lake Ontario. I think it looks awesome, but what is it?

 

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[pepperj]

Possibly Calcite

Common Fluorescent Minerals - The Fluorescent Mineral Society

Visible light is a form of electromagnetic radiation. Other forms of electromagnetic radiation are like light in many ways; they are just at different wavelengths that the human eye cannot see.

uvminerals.org

 

[fuss]

Biological material like a moss will fluoresce red under long wave UV and can be green in daylight.