Youngite Agate (Jasper) (WY), is an agatized rehealed breccia jasper found in the Guernsey Limestone near Hartville, Platte county Wyoming.  It may have a gray translucent druzy quartz around the outer part of the material.  The drusy quartz usually fluoresces green.  The jasper center varies in color from a light tan, to a peach, brown, reddish, salmon and variations of these colors. The material is very hard and was used by native people to make jewelry.  Youngite is a rare variety of quartz (Silicon Dioxide) and has a Mohs Scale hardness of 7.  Under long wavelength fluorescent light, it yields a blue network of fluorescence that follows the bands of drusy quartz.