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Hackmanite

Photo: Parent Géry / Wikimedia Commons (CC BY-SA 3.0)

Hackmanite

Also known as: Tenebrescent sodalite

Colour-changing sodalite that turns violet under UV and fades again in daylight.

  • ColourViolet, Pink, White, Grey
  • Mineral groupFeldspathoid (sodalite group)
  • ChemistryNa₈Al₆Si₆O₂₄(Cl₂,S)
  • Hardness (Mohs)5.5–6
  • Crystal systemCubic
  • Where it's foundCanada (Mont Saint-Hilaire), Greenland, Afghanistan, Myanmar, Russia
  • ChakraThird Eye
  • ZodiacSagittarius

What is Hackmanite?

Hackmanite is a variety of sodalite that shows tenebrescence: it changes colour when exposed to ultraviolet light (often turning violet or pink) and then fades back when kept in daylight or the dark – a cycle that can repeat indefinitely. It is named after Finnish geologist Victor Hackman.

Hackmanite astrology & birthstone

  • Zodiac signsSagittarius
  • Ruling planet—
  • ElementAir
  • Birthstone month—

Zodiac, planet and element links come from crystal-lore traditions and vary between authors. Birthstone months follow the American Gem Society list.

Hackmanite meaning & traditional properties

Hackmanite is associated with intuition, transformation and clarity in crystal traditions.

  • Intuition
  • Transformation
  • Clarity

Traditional and metaphysical properties are shared for cultural and educational interest. Crystals are not a substitute for medical advice or treatment.

How to use Hackmanite

  • Shine a UV torch on hackmanite and watch its colour change.

How to care for Hackmanite

Avoid knocks and harsh chemicals.

Looking for Hackmanite?

Hackmanite isn't in our shop right now – new stock arrives regularly. In the meantime, explore similar crystals we have available or browse our full crystal collection.

  • Sodalite
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    Sodalite

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  • Lapis Lazuli
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Rituals & pairings

Pair Hackmanite with a intuition & meditation ritual

A quiet meditation ritual for focus, intuition and clarity.

Traditionally paired with: Frankincense, myrrh, lotus or copal incense · A purple or white candle · Sage to clear the space

  • Clear the room with a little sage smoke and sit comfortably.
  • Light a purple or white candle and frankincense, lotus or copal incense.
  • Hold your crystal or rest it in front of you and breathe slowly for 5–10 minutes.
  • Note down any ideas or feelings that come up.

Safety: never leave candles, incense or smudge sticks burning unattended, keep them away from children, pets and anything flammable, and ventilate the room. Rituals are shared as tradition, not as a treatment.

Ritual oils, essential oils & perfumes

Deepen your practice: tarot & oracle cards

Wear it & work with it

Hackmanite jewellery & pendulums

Wear the energy of your favourite crystals every day – browse our handmade crystal jewellery and dowsing pendulums.

Hackmanite FAQs

Why does hackmanite change colour?

It is tenebrescent – UV light changes its colour, which fades again in visible light.

Related crystals

  • Sodalite
    In our shop

    Sodalite

    Royal blue stone with white veins, once used to decorate a royal residence – a crystal lore stone of logic ...

  • Lapis Lazuli
    In our shop

    Lapis Lazuli

    Royal blue rock flecked with gold pyrite, mined in Afghanistan for over 6,000 years and ground into ultrama...

  • Tanzanite

    Tanzanite

    Violet-blue gem found in only one small area near Mount Kilimanjaro – a December birthstone discovered in 1...

  • Iolite

    Iolite

    Violet-blue gem that changes shade as you turn it – linked in legend to Viking navigation.

Sources