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!

"Grape" Willemite - Franklin, New Jersey

Contributed by: Mark Cole
Date: Mar 10th, 2026
Locality: Franklin Mine, Franklin, Sussex County, New Jersey, USA (See on Mindat)
Size: 2.75 x 1 x 3 inches
Weight: 5.8 oz

Description:
This is perhaps the brightest fluorescent mineral on the planet (or pretty darn close). A beautiful grape color naturally, it fluoresces a very bright green. Interestingly, it is not at all phosphorescent.

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:

Willemite (Mindat) (RRUFF)

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

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