Blue spinel - Vietnam

Contributed by: FMS Admin
Date: May 10th, 2026
Locality: L?c Yên District, Yên Bái Province, Vietnam (See on Mindat)
Size: 18 x 11 x 24 mm

Description:
Small but really nice specimen, consisting of blue spinel (bright red fluorescence under longwave UV), along with some unknowns, fluorescing respectively yellowish under midwave and shortwave, and bright blueish-white under shortwave, on feldspar (very dim reddish fluorescence under SW); L?c Yên District, Yên Bái Province, Vietnam

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2024.

Fluorescence under longwave UV light.

Fluorescence under midwave UV light.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Corundum var. Sapphire (Mindat) (RRUFF)

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