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!

Paper Thin Calcite Crystals from China

Contributed by: FMS Admin
Date: Feb 24th, 2026
Locality: Hunan, China (See on Mindat)
Size: 3.5 x 1.75 x 4 inches
Weight: 13 oz

Description:
The calcite is highly fluorescent under three wavelengths.

Fluorescent pictures were taken at ISO-100, f/11 for 1.6 seconds.

Originally posted by John Rofrano on Nature's Rainbows.

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

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Red
  • Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Red
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red

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