Properties
Mineral group: Sodalite
Chemistry: Na8Al8Si8O24Cl2
Color: Pink Violet Blue
Crystal system: Isometric
Mohs Scale hardness: 5.5 to 6
Refractive index: 1.483 to 1.487
Birefringence:
Specific gravity: 2.27 to 2.33
Information
May be confused with
Azurite, dumortierite, hauynite, lapis lazuli and lazulite
Treatment
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Suitable instruments for identification (ID)
UV-light to determain the strong fluorucense to pink violet.
Polariscopes to determine crystal form and separate from a number of other possible gemstones.
Microscope / Loupe to examine inclusions.
The refractive index and density are very important data which are determined by refractometer and hydrostatic weighing.
Known deposites
Quebec in Canada and Afganistan
Miscellaneous
Named after Finnish geologist, Victor Axel Hackman [April 27, 1866 - 1941]. Professor at University of Helsinki (Helsingfors) and geologist with Finnish Geological Survey. Hackmanite (pink coloured sodalite) was discovered for the first time in cuttable qualities in 1991 in Quebec. The colour fades in light. Sincerly rare gemstone in other words.
Read / learn more about Hackmanite
Hackmanite in healing (Source: ChatGPT)
Hackmanite is a rare variety of sodalite, known for its unusual property of changing color under UV light (tenebrescent property). This makes it fascinating not only from a scientific perspective but also in crystal healing, where it is used for its spiritual and emotional energy.
Read/learn more about Hackmanite – Healing Properties
