Fluorescent opal specimen from the Virgin Valley, Humboldt County, Nevada, USA, this variety is sometimes known as 'common opal' due to its butter and uniform butterscotch colouration as opposed to the numerous varieties found in the area. It exhibits and excellent subvitreous lustre and conchoidal fracture as expected form this form of silica. When touched, it appears to have a some what waxy texture and measures approximately 25 x 20 mm in size. Its pale colouration however hides this pieces most surprising feature, it exhibits an fluorescent lime green colouration when exposed to shortwave UV lighting, appearing like something found out of this world. It is sure to make an excellent addition to any serious collection, both due to the locality it was found and for its fluorescent properties, the samples will come supplied in a card tray which has details typed onto the inside.