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!

Coral-Like Formation of Aragonite - Mexico

Contributed by: Chris Clemens
Date: Apr 30th, 2026
Locality: Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico (See on Mindat)
Size: 64 x 43 x 84 mm
Weight: 181 g

Description:
This is a bright white, branching coral-like formation of pristine aragonite that shows a beautiful multi-wave fluorescent response under UV. This specimen is from Mexico, probably Santa Eulalia, in the state of Chihuahua, but the label information was incomplete. Under shortwave UV the aragonite fluoresces beautiful shades of pastel green with bluish overtones. When the shortwave lamp is turned off, blue/green phosphorescence is seen. This piece also shows warm white fluorescence and pale green phosphorescence under longwave UV.

Originally posted by Chris Clemens on Nature's Rainbows in 2017.

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Afterglow after exposure to shortwave UV light.
Afterglow after exposure to shortwave 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:

Aragonite (Mindat) (RRUFF)

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

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