The interior of these specimens fluoresce a bright green under a long wave ultraviolet light, with blood red around the outer edges.

M248 - Composed of rhyolite, agate and quartz, these beautiful hollow geodes were formed by volcanic activity. Over thousands of years, trapped gas inside the cavity and moisture seepage caused continual crystal formation.

Dugways normally occur from 1 inch to 12 inches in diameter. They are found in western Juab County, Utah..