Johachidolite from Myanmar
Contributed by: Michael Crawford
minID: 0N9-EEA
Date: Sep 3rd, 2025
Locality: Pein-Pyit (Painpyit; Pyan Pyit), Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar (See on Mindat)
Size: 17 x 14 mm
Description:
A thumbnail specimen of bright orange johachidolite (CaAlB3O7) from Pein-Pyit, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar. The johachidolite fluoresces a very bright violet blue under longwave UV illumination. The johachidolite crystals are in a matrix of a white mineral that fluoresces off white under all wavelengths of UV light. The white mineral is likely a feldspar.
The longwave emission spectrum has a peak at 425 nm. The is no reference material available for the fluorescent activator for this rare mineral. A rare earth element is a possible activator for the johachidolite fluorescence.
The unknown white mineral’s emission spectrum is a broad peak with a maximum at 447 nm. The spectrum neither confirms or excludes this mineral being feldspar. XRD or Raman analysis is needed to get a positive ID for this mineral.
Summary of luminescence responses:
Johachidolite (Mindat) (RRUFF)
- Fluorescence under Longwave (365nm LED) UV light: Blue