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!

Prehnite – Franklin, New Jersey

Contributed by: Howie Green
Date: Mar 9th, 2026
Locality: Franklin Mine, Franklin, Sussex County, New Jersey, USA (See on Mindat)

Description:
Prehnite from Franklin, New Jersey. The first picture shows a beautiful face under shortwave UV. The second picture was taken using the Convoy 365nm LW flashlight. This light can light up rocks not normally thought to be LW fluorescent. Although not great color, it can be a valuable tool in the field when examining unknown rocks. Any hint of fluorescence means the specimen should be examined more closely under SW UV.

Originally posted by Howie Green on Nature's Rainbows.

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

Summary of luminescence responses:

Prehnite (Mindat) (RRUFF)

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

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