A polished hackmanite sphere of 58mm and 291g. In white light the surface shows a pale cream-white base with scattered soft pink-lavender hackmanite zones, irregular patches of dark grey feldspar, rust-brown iron oxide spots distributed across the surface, and natural crack lines following the mineral structure. The patterning gives the sphere a distinctly planetary character in daylight. The pink-lavender zones are the hackmanite in its tenebrescent state, activated by ambient light exposure. Under longwave UV (365nm) the display shifts entirely: the feldspar matrix emits a blue-white fluorescence across much of the sphere, the hackmanite zones glow orange-pink, and dark non-fluorescent patches create contrast. The result is a multi-color UV display where two minerals within the same sphere respond in completely different colors. Tenebrescence is hackmanite's reversible photochromic property: unexposed, the mineral appears white to pale grey; UV or sunlight shifts it to pink or violet, and ordinary indoor light or darkness bleaches it back. The pink-lavender zones on the daylight face are the hackmanite's tenebrescent color. The 365nm UV image reveals what the daylight view cannot: the multi-mineral composition of the host rock, with the blue-white fluorescing feldspar and the orange fluorescing hackmanite each occupying distinct zones. A sphere cut from a single mineral would glow uniformly; this one has two minerals glowing in different colors under the same UV source, which is what makes the display unusual. From Badakhshan, Afghanistan. Stone type: Natural Hackmanite (Tenebrescent Sodalite) Weight: 291g Size: 58mm Color: White, pale pink, grey Fluorescence (365nm): Strong orange (hackmanite zones), blue-white (feldspar matrix) Cut: Sphere (polished) Clarity: Opaque Treatment: Untreated Origin: Afghanistan Hardness: 5.5-6 Natural hackmanite sphere, 58mm, tenebrescent, Afghanistan.
