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!

Willemite Crystals from Franklin, New Jersey

Contributed by: Michael Crawford
Date: Jun 22nd, 2025
Locality: Franklin Mine, Franklin, Sussex County, New Jersey, USA (See on Mindat)
Size: 4.5 x 4.5 cm

Description:
A small specimen of clear and pale green willemite crystals on a fracture surface from the Franklin Mine, Franklin, New Jersey. The willemite fluoresces bright green under all wavelengths of UV illumination. The shortwave emission spectrum has a maximum of 521 nm.

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Normal light.
Normal light.
Shortwave Emission Spectra
Shortwave Emission Spectra

Summary of luminescence responses:

Willemite

  • Fluorescence under Longwave (365nm LED) UV light: Green
  • Fluorescence under Midwave (305nm LED) UV light: Green
  • Fluorescence under Shortwave (255nm LED) UV light: Green

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