Scanning electron micrograph of radiating bundles of fibrous erionite crystals from 11.3 m depth in drill core from Y-2. Yellowstone National Park, Wyoming. No date.

Figure caption: Scanning electron micrograph of radiating bundles of fibrous erionite crystals from 11.3 m depth in drill core from Y-2. Smectite (S) and intermediate-heulandite (H) are earlier deposits. Scale bar is 50 microns. No index card. Published as Figure 21 in Zeolites in Yellowstone National Park. The Mineralogical Record; 12: 29-38. Published as Figure 8 in Calcium zeolites in rhyolitic drill cores from Yellowstone National Park Wyoming. Zeolites '93 Conference Volume, D.W. Ming and F.A. Mumpton, (editors), International Committee on Natural Zeolites, Brockport, NY, 1995: 3-20.