Fluorescent Mineral Database

A new secret project! Trying to create a nice Fluorescent Mineral Database (FMDB), which would be searchable by mineral, locality, and luminescence properties. Also making it easy for people to contribute with their own specimens!

Calcite - Challenger Cave, Nuevo Leon, Mexico

Contributed by: FMS Admin
Date: Feb 23rd, 2026
Locality: Challenger Cave System, Monterrey Municipality, Nuevo León, Mexico (See on Mindat)
Size: 16 x 8 x 26 mm

Description:
Macro photos of a terlingua-type calcite crystal. This material is colorless in white light, bright pink in LW, and (not pictured) blue in SW. It also has a blue afterglow in all wavelengths. Pictured is LW and white light, and LW afterglow.

Originally posted by Dennis Michael on Nature's Rainbows.

Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Afterglow after exposure to longwave UV light.
Afterglow after exposure to longwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Pink
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
  • Afterglow after exposure to Longwave (365nm LED) UV light: Blue

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