Dims: 3.49x2.62x1.89" (8.85x6.64x4.80cm)
Wt: 10.18oz (288g)
This rock has a crystal of hackmannite passing through it. Hackmannite is the fluorescent, color-changing variety of sodalite, and this crystal has excellent color change. Normally, the sodalite has a white, translucent appearance, looking a lot like a vein of quartz through the host rock. Under long-wave ultraviolet, it fluoresces a bright yellow, and gradually (a few seconds to a few minutes) changes its visible light color to a bright pink, which fades under a bright light (such as sunlight). The fluorescent image does not do it justice - it really is a bright yellow. Hackmannite is a "must have" specimen for any fluorescent minerals collector.