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!

Bi-Color Feldspar, Pakistan

Contributed by: Mark Cole
Date: Mar 11th, 2026
Locality: Shigar Valley, Shigar District, Gilgit-Baltistan, Pakistan (See on Mindat)
Size: 3.5 x 1.5 x 4 inches
Weight: 9.9 oz

Description:
Some pieces of feldspar fluoresce in two different colors, nicely zoned. I have heard that the activator for the blue fluorescence is uranyl, unknown for the violet. This piece has a couple of small zircons that fluoresce yellow.

Originally posted by Mark Cole on Nature's Rainbows.

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Feldspar (Mindat) (RRUFF)

  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Blue
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Violet

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