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Fluorescent Youngite from Guernsey, Wyoming. Youngite is an agatized brecciated jasper with a coating of grayish translucent druzy quartz. Found in only one location, the youngite caves near Guernsey, Platte Co., Wyoming. The Youngite caves are located on private property, and have been off-limits to collectors for years. This is an awesome example of this cool rough. -WET pic. -(14.2 oz.) no fractures