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!

Elk Creek Baryte on Calcite - Meade County, South Dakota

Contributed by: FMS Admin
Date: Feb 25th, 2026
Locality: Elk Creek, Meade County, South Dakota, USA (See on Mindat)
Size: 2.75 x 1.25 x 2.75 inches
Weight: 4.5 oz

Description:
BARYTE ON YELLOW CALCITE. ELK CREEK, MEADE COUNTY, SOUTH DAKOTA

Fluorescent pictures were taken at ISO-100, f/11 for 1.6 seconds.

Originally posted by John Rofrano on Nature's Rainbows.

Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Fluorescence under midwave UV light.
Fluorescence under midwave UV light.
Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Afterglow after exposure to shortwave UV light.
Afterglow after exposure to shortwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Baryte (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: White
  • Fluorescence under Midwave (305nm Lamp/Mercury) UV light: White
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: White
  • Afterglow after exposure to Shortwave (254nm Lamp/Mercury) UV light: Blue

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