Dims: 5.5x3.6x0.3" (13.9x9.3x0.8cm)
Wt: 5.0 oz. (143g)
This is impressive - a specimen of hackmannite, a variety of sodalite. What makes it so special is that when it is exposed to long-wave ultraviolet, it fluoresces a bright yellow, AND CHANGES COLOR FROM WHITE TO CHERRY RED! Exposure to bright lights (or time) converts it back to the original color. Just about half of this slab is hackmannite, which is normally a translucent white (colorless and transparent in thin sections). While there is no hint of crystal shapes, this is one of those "must have" specimens.