Roger Weller, geology instructor
Clay Center, Ohio
The first view is a mineral
observed under normal light,
while the second is the same mineral viewed under ultraviolet light.
The fluorescent mineral is fluorite. Under normal light, the fluorite is
root beer brown, but under the ultraviolet light it fluoresces a pale
Photos are copyright free for non-commercial educational uses.
Just credit photos to R.Weller/Cochise College.