Fluorescent Chalcedony
Quartz comes in many different colors and is very pretty. But it normally does not fluoresce.
Chalcedony is the name given to a type of quartz. The white variety that forms into so called
roses normally fluoresces green when illuminated with short wave ultraviolet due to the presence of trace amounts of uranium.
Much fluorescent chalcedony has come out of the Peloncillo Mountains of Southwestern New Mexico, Hidalgo County, near Geronimo Pass. It comes from the lining in the interior of gas cavaties in rhyolite lava.
Chalcedony is the name given to a type of quartz. The white variety that forms into so called
roses normally fluoresces green when illuminated with short wave ultraviolet due to the presence of trace amounts of uranium.Much fluorescent chalcedony has come out of the Peloncillo Mountains of Southwestern New Mexico, Hidalgo County, near Geronimo Pass. It comes from the lining in the interior of gas cavaties in rhyolite lava.
I think this location in far southwest NM is near the geographic coordinates of 
31.515308N and -108.995296W.
31.515308N and -108.995296W. The area is sometimes called the Yankee Dog Field or the Yankee Dog Claim both in Hidalgo County.
Check out this web site in Japanese about Chalcedony from the Yankee Dog Field of Hildago, County NM: http://www.istone.org/quartz/chalcedony.html
