Description
Double terminated, twinned gypsum var. selenite crystal with fluorescent and phosphorescent hourglass with ultraviolet light. This piece has penetration crystals as well as twinning.
Size: 52 x 29 x 17 mm. 22 grams.
Locale: Willow Creek, Nanton, Alberta, Canada
Fluorescent and phosphorescent (there is a glow that remains briefly after the UV light is removed) with long wave, mid wave and short-wave ultraviolet light.