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!

Fluorite, May Stone Quarry, Ft. Wayne, Indiana

Contributed by: Chris Clemens
minID: XDV-3KJ
Date: Apr 21st, 2026
Locality: May Stone and Sand Quarry, Allen County, Indiana, USA (See on Mindat)
Size: 10 x 6 x 15 mm
Weight: 705 g

Description:
Large plate of water-clear, honey-colored fluorite crystals on a light grey limestone matrix. From the May Stone and Sand Quarry in Ft. Wayne, Indiana. As seen in the photo below, the fluorite shows a beautiful pastel violet response under longwave UV. The limestone matrix is also fluorescent under UV.

Originally posted by Chris Clemens on Nature's Rainbows in 2019.

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

Summary of luminescence responses:

Fluorite (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Violet

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