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 Lightning in a Hardystonite Sky

Contributed by: Chris Clemens
Date: Apr 25th, 2026
Locality: Franklin Mine, Franklin, Sussex County, New Jersey, USA (See on Mindat)
Size: 36.8 x 22.4 x 43.2 mm

Description:
Spectacular under shortwave UV, green, fluorescent willemite lightning bolts flash in a blue hardystonite sky in this specimen from the Franklin Mine, Franklin, New Jersey. Minor, small spots of red fluorescent calcite are also present.

Originally posted by Chris Clemens on Nature's Rainbows in 2016.

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

Summary of luminescence responses:

Hardystonite (Mindat) (RRUFF)

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

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