“Cluster of radiating, bladed, gypsum crystals, collected in the early 1980's from clay-rich Eocene sediments in rural King George County, Virginia. These gypsum crystals are fluorescent under UV and are also phosphorescent. The upper image shows bright blue/white fluorescence under short wave UV; the lower image was taken under visible light. ”

“Cluster of radiating, bladed, gypsum crystals, collected in the early 1980's from clay-rich Eocene sediments in rural King George County, Virginia. ”

“Cluster of radiating, bladed, gypsum crystals, collected in the early 1980's from clay-rich Eocene sediments in rural King George County, Virginia. As seen in this photograph, taken under short wave UV (254nm), these gypsum specimens show a bright blue/white fluorescent response. ”

“Same specimen showing pale blue phosphorescence following exposure to short wave UV (254nm). ”

“Cluster of radiating, bladed, gypsum crystals, collected in the early 1980's from clay-rich Eocene sediments in rural King George County, Virginia. As seen in this photograph, taken under long wave UV (365nm), these gypsum specimens show a bright blue/white fluorescent response. ”

“Same specimen showing pale green phosphorescence following exposure to long wave UV (365nm). ”