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!

Witherite from Rosiclare, Illinois, USA

Contributed by: Simone Conti
minID: 39Y-HL1
Date: Nov 23rd, 2025
Locality: Rosiclare, Hardin County, Illinois, USA (See on Mindat)
Size: 3 x 3 x 4 cm
Weight: 83.29 g

Description:
An aggregate of small witherite crystals. Fluorescent bluish white, greenish, and white under short, mid, and long wave UV light, respectively. After exposure to UV light it shows a nice greenish afterglow.

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.
Normal light.
Normal light.

Summary of luminescence responses:

Witherite (Mindat) (RRUFF)

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

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