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!

Creedite - Qinglong Mine, Guizhou, China

Contributed by: FMS Admin
Date: May 9th, 2026
Locality: Qinglong Mine (Dachang Mine), Dachang Sb ore field, Qinglong County, Qianxinan, Guizhou, China (See on Mindat)

Description:
Here is an amazing Creedite from the Qinglong Mine, in the Guizhou Province. Not only does the specimen have beautiful crystals in natural light, the reaction is also quite interesting in ultraviolet. There are two distinct colors in LW, with similar blue in MW and SW. Also apparent are some small phantoms in some of the crystals. It has a nice phosphorescence, too. According to a post on Facebook, the color variation, especially in LW may be due to varying amounts of gadolinium, cerium, europium and some humic acids. Who knew!

Originally posted by Fire Viper on Nature's Rainbows in 2017.

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

Summary of luminescence responses:

Creedite (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Blue
  • Fluorescence under Longwave (365nm LED) UV light: White
  • Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Blue
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
  • Afterglow after exposure to Shortwave (254nm Lamp/Mercury) UV light: Blue

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