Where to Find Anhydrite in Utah

Anhydrite in Utah comes from the Paradox evaporite sequence and the Carmel Formation. Massive blue-gray anhydrite is exposed in the cliffs around Crystal Geyser south of Green River in Emery County, and the Paradox Valley salt anticline carries anhydrite beds interbedded with halite and gypsum. The Cane Creek potash plant area near Moab has produced specimen-grade tabular anhydrite from drill core. Anhydrite dehydrates rapidly to gypsum in surface conditions, so collected pieces should be kept dry and sealed. Most surface anhydrite has already converted, and the crystallographic specimens come from underground exposures. The most productive ground is in Crystal Geyser area (Emery County), Paradox Valley anticline (Grand County), Cane Creek potash workings (San Juan County).

Casual hand collection of common rocks and minerals like anhydrite is allowed on most BLM and U.S. Forest Service land in Utah, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Always confirm rules before a trip.

Crystal Geyser area (Emery County) is the standout. Other strong ground includes Paradox Valley anticline (Grand County), Cane Creek potash workings (San Juan County).