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Hackmatite COLOR CHANGE, popular with Japanese,.9ct.-1.6ct.

These are fine examples of natural Hackmatite with even color. Often this gem has many white inclusions but not these ones.

Hackmatite is very popular in Japan, probably because of the soft and sweet color. These are true color change they change color from a soft pink to a deep purplish lavender in the warmth of your hand. 


Approximate dimensions are as follows; around 7mm, 1 cabochon weighs .91ct the rest weigh from 1.2ct to 1.6ct.

Each of these gems comes with a copy of the lab identification / origin report.


Hackmanite is an exceptionally rare sulfur-rich variety of sodalite which has the ability to change color when exposed to sunlight. It was first discovered in Greenland in 1896 by L. C. Boergstroem, and was later named after Victor Axel Hackman (1866-1941), a Finnish geologist. The change in color can be seen within seconds of being exposed to sunlight, but the return of the original color can sometimes take up to a week. The color change effect can be repeated indefinitely, but is destroyed by heating.


Gemological Properties:
Chemical Formula: Chloric sodium aluminum silicate
Crystal Structure: Cubic - rhombic dodecahedron
Hardness: 5.5 to 6 on the Mohs scale
Refractive Index: 1.48
Density: 2.14 to 2.40
Cleavage: Indistinct
Transparency: Transparent to opaque
Double Refraction None
Luster: Vitreous to greasy
Fluorescence: Strong



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