someHerrings:
Utah Sphalerite - WL
someHerrings:
Utah Sphalerite - UVa
someHerrings:
Utah Sphalerite - UVb
someHerrings:
Utah Sphalerite - UVc
someHerrings:
Utah Sphalerite - PHOS
someHerrings:
Utah Sphalerite - PHOS (photostimulated phosphorescence darkening)