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 Crystals in a Septarian Nodule from Grayson County, Texas

Contributed by: Bart Pickard
Date: Mar 21st, 2026
Locality: Grayson County, Texas, USA (See on Mindat)

Description:
Lovely bright pale yellow fluorescent calcite crystals in a septarian nodule found in Grayson County, Texas.

Originally posted by Bart Pickard on Nature's Rainbows in 2016.

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

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

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

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