Where to Find Chalcedony in Idaho

Idaho has 6 mapped collecting spots that report chalcedony, spread across 6 counties. The largest share sits in Ada County County with 1 spot. 6 of the spots are on land mapped as publicly accessible.

Spot list checked against source data on April 1, 2026.

Standout chalcedony spots in Idaho

Hand-picked from the full list below, with the reason each one earns a trip.

Little Wood River
Blaine County County
Little Wood River is the strongest Blaine County pick because the same drainage is listed for green and moss agate by Idaho Department of Lands and has Mindat specimen records from the Little Wood Reservoir area. Its agate, chalcedony, and jasper add a useful south-central Idaho counterpoint to the better-known Owyhee localities.
Parker Mountain
Lemhi County County
Parker Mountain gives Lemhi County a documented agate and chalcedony locality outside the crowded southern Idaho fields. Idaho Department of Lands lists green and green-moss agate near Parker Mountain, while Mindat records agate and chalcedony within the Parker Mountain mining district mineral list.

Best counties for chalcedony in Idaho

Ranked by the number of mapped chalcedony spots. County links open the full rockhounding page for that county.

Every chalcedony spot we track in Idaho

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
Ada CountySouth Pleasant Valley Road	Ada County	Agate Chalcedony Jasper Petrified Wood Opalized Wood	43.3845, -116.2326	Public
Little Wood River	Blaine County	Agate Chalcedony Jasper	43.3925, -113.9974	Public
Salmon RiverSalmon River Trail #96	Idaho County	Agate Chalcedony Jasper Petrified Wood	45.4632, -115.7870	Public
Parker MountainNational Forest Development Road 68	Lemhi County	Agate Chalcedony	44.6068, -114.5458	Public
Bruneau DesertBalanced Rock Road	Owyhee County	Agate Chalcedony Jasper	42.5729, -115.1896	Public
Grouse Creek	Washington County	Banded Agate Iris Agate Chalcedony	44.3758, -117.1738	Public

Before you go

Read the chalcedony identification guide so you know what a keeper looks like in the field: Chalcedony in the encyclopedia.

Chalcedony in Idaho FAQ

Where can you find chalcedony in Idaho?+

The mapped spots concentrate in Ada County County, Blaine County County, and Idaho County County. Every spot on this page appears on the map above with coordinates and access notes.

How many chalcedony spots are mapped in Idaho?+

6 spots across 6 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.

Is it legal to collect chalcedony in Idaho?+

Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 6 of the 6 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.

Where else to find chalcedony

More minerals to hunt in Idaho

Hunt chalcedony in Idaho with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.