Yttrofluorite - Hundholmen, Norway

Contributed by: FMS Admin
Date: May 6th, 2026
Locality: Hundholmen, Narvik, Nordland, Norway (See on Mindat)
Size: 1.5 x 2 inches

Description:
Yttrofluorite is defined as fluorite (CaF₂), where the rare earth element yttrium replaces some of the calcium atoms, and therefore has the molecular formula (Ca,Y)F₂. Regardless of the science, yttrofluorite is a subtle, and truly stunning fluorescent mineral glowing in all wavelengths.

Originally posted by Fire Viper on Nature's Rainbows in 2019.

Fluorescence under longwave UV light.

Fluorescence under midwave UV light.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Yttrofluorite (Mindat) (RRUFF)

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