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!

Gypsum var. Selenite - Manitoba, Canada

Contributed by: FMS Admin
Date: May 8th, 2026
Locality: Red River Floodway, Winnipeg, Winnipeg Metro Region, Manitoba, Canada (See on Mindat)

Description:
Selenite from the Red River Spillway (Floodway) in Winnepeg, Manitoba, Canada should be on everyone's list to add to their collection. Beautiful in natural light, it is also very bright in longwave UV and reasonable in midwave and shortwave UV, also quite phosphorescent. Some folks call the crystals "duckbill", as they are often twinned. Some specimens often have very large crystals extending from the center ball and are very sought after.

Originally posted by Fire Viper on Nature's Rainbows in 2018.

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

Summary of luminescence responses:

Gypsum var. Selenite (Mindat) (RRUFF)

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

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