Hackmanite, Scapolite and Feldspar - Myanmar

Contributed by: FMS Admin
Date: May 10th, 2026
Locality: Pein-Pyit (Painpyit; Pyan Pyit), Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar (See on Mindat)
Size: 33 x 28 x 61 mm
Weight: 7 g

Description:
Small but really nice specimen, consisting of sodalite var. hackmanite, along with scapolite and feldspar.

The hackmanite shows deep tenebrescence upon exposure to all UV wavelengths and fluoresces quite brightly under longwave. The scapolite fluoresces very bright yellow under longwave, moderately bright yellow under midwave and orange yellow under shortwave. The feldspar fluoresces a dim light blue under longwave, and very dim dull red under shortwave.

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.

Afterglow after exposure to shortwave UV light.

Tenebrescence after exposure to shortwave UV light.

Normal light.

Summary of luminescence responses:

Feldspar (Mindat) (RRUFF)

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

• Fluorescence under Longwave (365nm LED) UV light: Orange
• Fluorescence under Midwave (305nm LED) UV light: Blue
• Fluorescence under Shortwave (255nm LED) UV light: White
• Afterglow after exposure to Shortwave (255nm LED) UV light: White
• Tenebrescence after exposure to Shortwave (255nm LED) UV light: Purple

• Fluorescence under Longwave (365nm LED) UV light: Yellow
• Fluorescence under Midwave (305nm LED) UV light: White