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Description
Hackmanite (tenebrescent sodalite) 14.4g fluorescentA rough hackmanite specimen with a soft pale lavender mauve hackmanite zone in the upper portion, graduating into warm beige tan feldspar matrix below. The rough, naturally cleaved surfaces show the blocky crystalline character of the mineral. In white light the hackmanite reads as a gentle, muted lavender rather than a saturated purple. After UV exposure the hackmanite zone deepens considerably, shifting to a richer, more saturated purple that is
A rough hackmanite specimen with a soft pale lavender-mauve hackmanite zone in the upper portion, graduating into warm beige-tan feldspar matrix below. The rough, naturally cleaved surfaces show the blocky crystalline character of the mineral. In white light the hackmanite reads as a gentle, muted lavender rather than a saturated purple. After UV exposure the hackmanite zone deepens considerably, shifting to a richer, more saturated purple that is visibly stronger than the resting state. Under longwave UV (365nm) the stone glows brilliant orange-yellow across most of the surface, with a darker non-fluorescent patch in the lower-center where the feldspar matrix content is higher.
Tenebrescence is the reversible photochromic property that defines hackmanite: in darkness or ordinary indoor light the mineral appears white to pale grey; UV light or sunlight shifts it toward pink or violet, and returning it to darkness gradually bleaches it back to pale. The cycle repeats without limit and without any change to the mineral's structure. From Badakhshan, Afghanistan, the primary global source for tenebrescent hackmanite. The contrast between the orange-fluorescing hackmanite zones and the dark non-fluorescent feldspar in the 365nm photo makes the mineral distribution within the host rock easy to read at a glance.
- Stone type: Natural hackmanite (tenebrescent sodalite)
- Weight: 14.4g
- Size: 34.4x23x16mm
- Color: Pale lavender (white light); purple (after UV)
- Fluorescence (365nm): Strong orange
- Cut: Rough
- Clarity: Opaque
- Treatment: Untreated
- Origin: Afghanistan
Natural hackmanite, tenebrescent sodalite, Afghanistan, sold loose.
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