Hourglass Gypsum var. Selenite Floater Crystal from Willow Creek, Alberta, Canada

This selenite crystal was found during a project at Willow Creek, near Nanton, Alberta in the early 1990s. The occurrence was in clay, which preserved and protected the crystals from weathering. Willow Creek selenite crystals are fluorescent under ultraviolet light, exhibiting an “hourglass” pattern that is not visible in normal light.