Hackmanite.

Blue hackmanite is a rarest and beautiful variety of the mineral sodalite, known for its unique property of tenebrescence, meaning it can change color when exposed to UV light. Hackmanite typically appears white, grey, or light pink, but the variety from Afghanistan is especially prized for its deep blue to violet hues. The blue hackmanite from Afghanistan often exhibits strong fluorescence under UV light, shifting from a rich blue to pink or violet tones, then returning to its original color once the light source is removed. This stunning transformation, combined with its rarity, makes Afghan blue hackmanite highly sought after by mineral collectors and gemstone enthusiasts. Afghanistan, especially in the region of Badakhshan, is known to produce high-quality hackmanite. The Afghan varieties