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!

Hardystonite, Clinohedrite, Willemite, Calcite - Franklin, New Jersey

Contributed by: FMS Admin
Date: Feb 23rd, 2026
Locality: Franklin Mine, Franklin, Sussex County, New Jersey, USA (See on Mindat)
Size: 64 x 38 x 74 mm

Description:
A classic Franklin SW piece. Areas of deep violet blue hardystonite alternate with non-fluorescent andradite garnet. Orange clinohedrite is visible within the hardy and in several streaks crossing the piece. Bright green willemite adorns the rest, and a few specs of red calcite are also visible.

Originally posted by Dennis Michael on Nature's Rainbows.

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
Clinohedrite (Mindat) (RRUFF)
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Orange

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