Hydroxylherderite - Youno Mine, Dassu District, Pakistan

Contributed by: Mark Cole
Date: Mar 26th, 2026
Locality: Dassu, Braldu Valley, Shigar District, Gilgit-Baltistan, Pakistan (See on Mindat)

Description:
Equally fluorescent LW, MW, or SW

Originally posted by Mark Cole on Nature's Rainbows in 2015.

Fluorescence under shortwave UV light.

Normal light.

Summary of luminescence responses:

Hydroxylherderite (Mindat) (RRUFF)

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