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!

Hyalite Opal - San Luis Potosi, Mexico

Contributed by: FMS Admin
minID: RXW-957
Date: Feb 23rd, 2026
Locality: San Luis Potosí, Mexico (See on Mindat)
Size: 64 x 56 x 70 mm

Description:
Macro photos of glassy botryoidal hyalite on matrix. The textures are remarkable in white light, and LW produces a very bright green fluorescence. SW, not pictured, yields the same color. The field of view shown is 20-25mm.

Originally posted by Dennis Michael on Nature's Rainbows.

Fluorescence under longwave UV light. FOV 25mm
Fluorescence under longwave UV light. FOV 25mm
Normal light. FOV 25mm
Normal light. FOV 25mm
Fluorescence under longwave UV light. FOV 20mm
Fluorescence under longwave UV light. FOV 20mm
Normal light. FOV 20mm
Normal light. FOV 20mm

Summary of luminescence responses:

Opal-AN (Mindat) (RRUFF)

  • Fluorescence under Longwave (365nm LED) UV light: Green
  • Fluorescence under Shortwave (254nm Lamp/Mercury) UV light: Green

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