Scanning electron micrograph of laumontite crystals from about 86 m in drill hole Y-3. Yellowstone National Park, Wyoming. No date.

Figure caption: Scanning electron micrograph of laumontite crystals from about 86 m in drill hole Y-3. Fine particles on crystals are mixed-layer illite-montmorillonite. Scale bar is 300 microns. No index card. Published as Figure 17 in Zeolites in Yellowstone National Park. The Mineralogical Record; 12: 29-38. Published as Figure 10 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.