Crystopedia
Mineral variety ✺ Glows under UV

Hackmanite

Blue

Variety of Sodalite.

Hackmanite specimen
Hackmanite, winchite 1.JPG · Wikimedia Commons (see file page for author & license)

📜 Key facts

Origin & sourcesMont Saint-Hilaire (Quebec), the Ilímaussaq complex (Greenland), Afghanistan and Myanmar.
CompositionSulfur-bearing variety of sodalite, Na₈Al₆Si₆O₂₄(Cl,S)₂

Mineral data: see Sodalite.

✺ Glows under UV

Longwave UV (~365 nm)Orange
Tenebrescence (colour change)Tenebrescent: UV, especially shortwave, deepens its colour to pink or violet, which fades again in daylight or under visible light
Hackmanite under UV light
Hackmanite, winchite sous UVL 2.JPG · Wikimedia Commons

Hackmanite is the sodalite variety that shows tenebrescence, a reversible colour change caused by light.

Reactions vary by locality and specimen; many specimens of a fluorescent species do not glow. Shortwave UV can burn skin and damage eyes. Wear UV-blocking glasses, and never look into any UV lamp. Sources: Wikipedia: Sodalite. More UV-reactive stones →

🌍 Where it's found

  • Type locality
  • Notable source / deposit
  • Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

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