Hackmanite, Scapolite, Johachidolite, etc. - 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: 18 x 15 x 26 mm
Weight: 7 g

Description:
Small but lovely specimen, consisting of hackmanite, scapolite, johachidolite and feldspar. The hackmanite is so tenebrescent, even under longwave UV, that the fluorescence gets rather dim almost instantly, when the tenebrescence sets in. You barely have enough time to press the camera trigger, and the color has already changed! One of the most intensely tenebrescent hackmanites I have ever seen, from any locales.

A small area of the hackmanite, adjacent to a small black grain of uranothorianite, has increased fluorescence. The scapolite in this specimen fluoresces more dimly than other specimens I have from the same locality, which is a good thing otherwise it would overpower the rather dim fluorescence of the hackmanite. It fluoresces yellow under longwave, and beige under midwave and shortwave. Johachidolite fluoresces blue under longwave.

An unidentified mineral enclosed within the scapolite fluoresces very bright yellowish green under midwave and shortwave.

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