Roger Weller, geology instructor
firstname.lastname@example.org copyright 2010-R.Weller
Scheelite also fluoresces a bright blue-white under an ultraviolet light.
Coincidentally, scorpions also fluoresce the same color. A rule among prospectors
who use ultraviolet lamps at night is "Don't pick up a moving scheelite crystal."
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.