Where to Find Chalcedony in Montana
9 mapped chalcedony rockhounding spots in Montana, across 7 counties. Chalcedony is the parent name for microcrystalline quartz, including agate, jasper, carnelian, and chrysoprase. Montana is famous for its sapphires, Yogo and otherwise, and for the Montana moss agate gravels along the Yellowstone River.
Map of 9 chalcedony rockhounding spots in Montana
Chalcedony by county in Montana
Counties ranked by number of chalcedony spots in our database.
Every chalcedony spot in Montana
Sorted by county. Coordinates open in Google Maps. Click a row for details.
| Spot | County | Minerals | Coordinates | Access |
|---|---|---|---|---|
| Big Horn CanyonRoute 211 | Big Horn County | 45.3130, -107.9604 | Public | |
| Pryor MountainsBad Pass Road | Big Horn County | 45.2386, -108.2675 | Public | |
| Mount BlackmoreBlackmore Trail | Gallatin County |
| 45.4447, -111.0035 | Public |
| American Bar | Lewis and Clark County | 46.8131, -111.9292 | Public | |
| Missouri RiverDanas Point Drive | Lewis and Clark County | 46.7284, -111.8746 | Public | |
| Jefferson RiverPrimrose Lane | Madison County | 45.6902, -112.2745 | Public | |
| MinerTom Miner Creek Road | Park County | 45.1918, -110.9271 | Public | |
| TerryBroadview Bench Road | Prairie County | 46.7727, -105.2599 | Public | |
| Yellowstone River (Billings area)Highway 312 | Yellowstone County |
| 45.9054, -108.3174 | Public |
Chalcedony in Montana FAQ
Where can I find chalcedony in Montana?+
RockHoundR tracks 9 chalcedony spots in Montana, spread across 7 counties. The strongest concentration is in Big Horn County.
Is collecting chalcedony legal in Montana?+
Casual hand collection of common rocks and minerals like chalcedony is allowed on most BLM and U.S. Forest Service land in Montana, 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.
What is the best chalcedony location in Montana?+
Big Horn County has the most chalcedony spots in our database for Montana. The full county breakdown is below — different counties produce different qualities and varieties.
Other states for chalcedony
Hunt chalcedony in Montana on the map
Open RockHoundR for live land overlays, weather, geology, and saved spots.
