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: 61 x 25 x 20 mm. 36 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.