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 from Monteriggioni, Italy

Contributed by: FMS Admin
Date: Feb 27th, 2026
Locality: Monteriggioni, Siena Province, Tuscany, Italy (See on Mindat)
Size: 3.5 x 3.5 x 6.5 cm
Weight: 337 g

Description:
On the typical yellow limestone matrix of this Italian locality, there are several calcite crystals. Their color varies from white to honey and the dimensions are about 10mm.

Calcite fluoresces yellow, very bright at every UV wavelength. In SW some zones seem to tend to green.
It’s phosphorescent too (green).

The origin locality is more famous for the black quartz...type it on google....

Originally posted by Stefano Buzzoni on Nature's Rainbows.

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.
Fluorescence under longwave UV light. Side 2.
Fluorescence under longwave UV light. Side 2.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

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

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