Hackmanite is a captivating and unique mineral known for its remarkable color-changing properties. A member of the sodalite group, Hackmanite exhibits an extraordinary phenomenon called tenebrescence, which means it changes color when exposed to ultraviolet light. In its natural state, it often appears pale pink or violet, but when subjected to UV light, it undergoes a striking transformation, darkening to deep violet, blue, or even gray. This mesmerizing characteristic makes Hackmanite a sought-after gem for collectors and enthusiasts of rare minerals. These pieces were mined in Saint Hilliare, Quebec.