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, Willemite and Rhodonite - Franklin, New Jersey

Contributed by: Chris Clemens
Date: May 1st, 2026
Locality: Franklin Mine, Franklin, Sussex County, New Jersey, USA (See on Mindat)
Size: 58 x 47 x 73 mm
Weight: 161 g

Description:
This is a classic mineral association from Franklin, New Jersey; brightly fluorescent calcite and willemite in combination with pink rhodonite and black franklinite. Under shortwave UV the calcite fluoresces bright red/orange and the willemite shows a green response. The rhodonite is not fluorescent.

Originally posted by Chris Clemens on Nature's Rainbows in 2017.

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

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Red
Willemite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green

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