The Lightbulbs, amethyst scepters, Washington State

Figure 13. The Lightbulbs, amethyst scepters, specimen 11.5 × 12 cm, Rolling Thunder Pocket, Purple Hope No. 4, collected July 2013. Jeff Scovil photo. Dillhoff, Richard M. and George, Joe. 2016. The Purple Hope Claims: Green Ridge Middle Fork of the Snoqualmie River, King County Washington. Rocks & Minerals. Volume 91, November/December 2016. 498-517.