Where to Find Chalcedony in Oregon

Oregon chalcedony is famous for the Holley blue agate of Linn County, a translucent gray-blue chalcedony from the Holley pegmatite area east of Lebanon. The Lakeview region in Lake County yields pink and apricot chalcedony rosettes in basalt, and the Owyhee plateau on the Oregon-Idaho border produces the heavy blue chalcedony nodules that hold the famous Owyhee blue agate banding. Coast pebbles from Agate Beach to Coos Bay add tide-worn carnelian and white chalcedony. Most inland chalcedony is float on rhyolite or basalt slope wash, and the better material concentrates in dry washes after spring rains. The most productive ground is in Holley blue agate (Linn County), Lakeview rosettes (Lake County), Owyhee plateau (Malheur County).

Casual hand collection of common rocks and minerals like chalcedony is allowed on most BLM and U.S. Forest Service land in Oregon, 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.

Holley blue agate (Linn County) is the standout. Other strong ground includes Lakeview rosettes (Lake County), Owyhee plateau (Malheur County).