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Hackmanite is a very rare natural mineral that exhibits tenebrescence. In the sun, the stone acquires a dark purple color. Hackmanite is a rare variety of sodalite (Na₈Al₆Si₆O₂₄Cl₂), which is known for its unique ability to change color and fluoresce. This phenomenon, known as tenebrescence, means that hackmanite darkens after exposure to UV light and then its color gradually returns to its original shade. Thanks to this, it is one of the minerals that fascinates geologists, collectors and lovers of natural curiosities.
Weight: 7.9 g
Dimensions: 3.29 x 2.59 x 0.88 cm
Color: lavender purple, under UV light intense pink - orange
Country of origin: Badakhshan, Afghanistan
You always buy the mineral shown in the photo!
Attractive natural Hackmanite from Afghanistan in a raw collector form, distinguished by its vivid violet to pinkish-violet color, subtle translucency and natural stone structure. The surface shows lighter whitish to cream-colored areas, small natural irregularities and a glassy to slightly greasy-looking luster typical of raw mineral specimens.
Hackmanite is a rare sulfur-bearing variety of sodalite from the feldspathoid group. It is valued mainly for its unusual color and, in some specimens, for its ability to change color under UV light or intense light. This phenomenon is known as tenebrescence or reversible photochromism. The intensity of the color change may vary from piece to piece and depends on the specific composition, lighting conditions and natural properties of the individual specimen.
Afghan Hackmanite is a sought-after collector mineral because it combines violet, pink and lighter mineral zones in one natural piece. It is suitable for a mineralogical collection, display cabinet or as an interesting natural stone for customers looking for a less common mineral with a distinctive appearance and origin from an important Asian locality.
| Mineral | Hackmanite |
| Locality | Afghanistan |
| Mineralogical group | Sodalite group / feldspathoids |
| Approximate composition | Sulfur-bearing variety of sodalite, a sodium aluminosilicate with chlorine and sulfur |
| Color | Violet, pinkish violet, pale lilac to whitish natural areas |
| Interesting feature | Hackmanite may show tenebrescence – a light-influenced color change |
| Appearance | Raw natural piece with violet-pink coloration, lighter zones and a natural mineral surface |
Hackmanite should be protected from falls, strong impacts, pressure, chemicals and long-term exposure to extreme conditions. For normal care, a dry soft cloth or a fine brush is sufficient. For collector specimens, we recommend keeping the stone dry, protected from mechanical damage and stored separately from harder minerals.
1 piece = 1 original. Every natural Hackmanite has its own shade, pattern, translucency, shape, surface and light reaction. The photographs show the exact offered piece.
Hackmanite is a very rare natural mineral that exhibits tenebrescence. In the sun, the stone acquires a dark purple color. Hackmanite is a rare variety of sodalite (Na₈Al₆Si₆O₂₄Cl₂), which is known for its unique ability to change color and fluoresce. This phenomenon, known as tenebrescence, means that hackmanite darkens after exposure to UV light and then its color gradually returns to its original shade. Thanks to this, it is one of the minerals that fascinates geologists, collectors and lovers of natural curiosities.
Weight: 7.9 g
Dimensions: 3.29 x 2.59 x 0.88 cm
Color: lavender purple, under UV light intense pink - orange
Country of origin: Badakhshan, Afghanistan
You always buy the mineral shown in the photo!
