Rockhounding in Sweetwater County, Wyoming: 10 Spots & Minerals

Standouts in Sweetwater County

Hand-picked spots in Sweetwater County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.

Top pick
Eden Valley
Public
Sweetwater County
Eden Valley is the Wyoming benchmark for silicified and agatized wood, with Mindat records tying petrified wood to Eden Valley and the Blue Forest area. It also has unusually clear legal framing, since BLM specifically allows limited personal-use petrified wood collecting on open public land while keeping fossil and commercial-use rules separate.
Silicified Wood
Top pick
Wamsutter
Public
Sweetwater County
Wamsutter is the practical Wyoming stop for dark fossiliferous lapidary material sold as Turritella agate, more accurately tied to silicified Green River Formation gastropods. The locality stands out because the material is both fossil-rich and polishable, but BLM fossil rules still matter because vertebrate fossils and scientifically significant specimens are not casual-collecting targets.
Turritella Agate

Spots in Sweetwater County

Spot	Minerals	Coordinates	Access
Bitter CreekBitter Creek Road	Tschermigite	41.5443, -108.5464	Public
Eden Valley	Silicified Wood	42.0291, -109.5405	Public
Farson	Agate Chalcedony Chert Jasper Quartz Silicified Wood	42.1694, -109.4311	Public
GrangerUS 30	Turritella Agate	41.5691, -109.9348	Public
Green River	Agate Chalcedony Jasper Silicified Wood	41.5167, -109.7124	Public
Red DesertTipton-North Road	Agate Chalcedony Chert Jasper Quartz Silicified Wood	41.8194, -108.2799	Public
Rock Springs	Agate Chalcedony Chert Jasper Quartz Silicified Wood	41.6163, -109.1605	Public
Steamboat Mountain	Agate Chalcedony Jasper Petrified Wood	41.9624, -108.9657	Public
Sweetwater CountyWY 374	Agate Chalcedony Chert Jasper Petrified Wood Silicified Wood Quartz Turritella Agate	41.5388, -109.4846	Public
Wamsutter	Turritella Agate	41.5699, -108.0076	Public

Neighboring counties in Wyoming

Adjacent rockhounding counties, ranked by how close their centroids sit to Sweetwater County. A natural extension if Sweetwater County is already on your trip plan.

Sweetwater County FAQ

Where can I rockhound in Sweetwater County, Wyoming?+

RockHoundR tracks 10 rockhounding spots in Sweetwater County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Sweetwater County?+

Spots in Sweetwater County most often produce Agate, Chalcedony, Jasper, Silicified Wood, Chert. Individual spots can vary widely.

Are these Sweetwater County rockhounding spots on public land?+

Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.

Plan a Sweetwater County rockhounding trip

Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.

Rockhounding in Sweetwater County, Wyoming

Sweetwater County rockhounding photos

Minerals reported in Sweetwater County