Fluorescent Kyanite from Brazil

Contributed by: Mark Cole
Date: Apr 9th, 2026
Locality: Minas Gerais, Brazil (See on Mindat)
Size: 3 x 2 x 5 inches
Weight: 1.6 lb

Description:
Some kyanite has always been known to be weakly fluorescent - a pale red under longwave UV. With the advent of powerful LW LEDs this mineral can be found with a relatively bright reaction and is quite attractive. But don\'t expect to see this under archaic blacklights - you need a powerful LW LED.

Originally posted by Mark Cole on Nature's Rainbows in 2018.

Fluorescence under longwave UV light.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Kyanite (Mindat) (RRUFF)

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