Hackmanite is a rare and fascinating variety of sodalite, which is a member of the feldspathoid mineral group. What sets hackmanite apart is its unique property called tenebrescence, which means it can change colour when exposed to different types of light. It is most commonly found in shades of pink, lavender, or grey when it is in its natural state, but when exposed to ultraviolet (UV) light or sunlight, it can transform into a deep violet or blue colour. This reversible colour change is one of the most remarkable features of hackmanite.

Hackmanite is often used as a collector's item for its colour-changing property and its rarity. Some people appreciate its aesthetic appeal and unique optical effects, while others may be drawn to its metaphysical properties.

Hackmanite is believed to help balance and soothe emotions. It may assist in managing stress, anxiety, and emotional turbulence, promoting a sense of calm. Some practitioners suggest that hackmanite can heighten awareness, intuition, and psychic abilities. It is thought to help individuals connect with their inner wisdom and spiritual insights. Hackmanite is associated with promoting sensitivity and empathy towards others. It may help individuals develop a greater understanding of the feelings and needs of those around them. One of the most distinctive features of hackmanite is its ability to change colour upon exposure to ultraviolet light or sunlight. Some practitioners believe that this colour-changing property represents adaptability and transformation on a spiritual level.