Erionite, Clinoptilolite Rock Island Dam Douglas Co. Washington USA (2002) FOV:1.6 mm Post author:GaryK Post published:2022-05-19 Post category:Blog FacebookTweetPinEmailPrint FacebookTweetPinEmailPrint You Might Also Like Geology Guides for PA Parks 2009-05-22 Mimetite Richmond Sitting Bull Mine Galena Lawrence Co. South Dakota USA FOV:1.6 mm 2021-09-04 #3590 Cowlesite, Thomsonite Beech Creek Quarry Grant Co. Oregon USA (2025) FOV:3.5 mm 2025-05-16