Fluorescent Mineral Database

Multi-wavelength Tenebrescent Hackmanite - Sudbury District, Ontario, Canada

Contributed by: FMS Admin
minID: MP1-9PV
Date: May 17th, 2026
Locality: Sudbury District, Ontario, Canada (See on Mindat)
Size: 4 x 2.3 x 4 cm

Description:
Small but nice specimen of sodalite var. hackmanite, from a recent find in the District of Sudbury, in Ontario, Canada. It is associated with non-fluorescent feldspar, and some blueish-white fluorescing calcite. This calcite shows a green phosphorescence upon exposure to all UV wavelengths (LW shown); the hackmanite is nicely tenebrescent upon exposure to all wavelengths (darkest upon SW exposure, as usual, but dark LW too).

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021.

Fluorescence under longwave UV light.
Fluorescence under longwave UV light.
Tenebrescence after exposure to longwave UV light.
Tenebrescence after exposure to longwave UV light.
Fluorescence under shortwave UV light.
Fluorescence under shortwave UV light.
Tenebrescence after exposure to shortwave UV light.
Tenebrescence after exposure to shortwave UV light.
Fluorescence under midwave UV light.
Fluorescence under midwave UV light.
Afterglow after exposure to longwave UV light.
Afterglow after exposure to longwave UV light.
Normal light.
Normal light.

Summary of luminescence responses:

Hackmanite (Mindat) (RRUFF)

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

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