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Rockville: Opalized Wood & Agatized Wood Rockhounding in Malheur County, Oregon

Updated August 2026

Rockville is a mapped rockhounding spot in Malheur County, Oregon. Reported finds include opalized wood, agatized wood, chalcedony, geode, agate, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Map showing Rockville in Malheur County, Oregon

Quick details

Access
Check locally
State
Oregon
Nearest road
Succor Creek Road

Geology at Rockville

This spot sits on Oregon-Idaho Graben; Upper member, mapped as vitric tuff, white, pale yellow; fossils: vertebrates fossils, bentonitic claystone, grayish green; fossils: vertebrates fossils, tuffaceous siltstone, and pale yellow that formed roughly 23 to 5 million years ago. Volcanic rock like this is classic geode and thunderegg country: gas cavities in the old flows can line themselves with quartz or agate over time.

Mapped unit
Oregon-Idaho Graben; Upper member
Age
23–5 Ma (Miocene)
Rock types
vitric tuff, white, pale yellow; fossils: vertebrates fossils, bentonitic claystone, grayish green; fossils: vertebrates fossils, tuffaceous siltstone, and pale yellow
Elevation
3,850 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Rockville

Best months: March to November. Typical highs run 90°F in midsummer and 38°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, ROCKVILLE 5 N station (3 mi away), adjusted for elevation.

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

State guidance last verified:

Found at Rockville

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Rockville.

Across the state line from Rockville

Rockville is close enough to the Oregon border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Rockville FAQ

Where is Rockville?+
Rockville is in Malheur County, Oregon, at 43.32366, -117.11969. Nearest road: Succor Creek Road.
What rocks and minerals can you find at Rockville?+
Rockville is reported to produce Opalized Wood, Agatized Wood, Chalcedony, Geode, Agate, Jasper, Common Opal.
Is collecting allowed at Rockville?+
Confirm rules before collecting. Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ. Always confirm current rules with the managing agency before a trip.
What tools should I bring to Rockville?+
Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.
When is the best time to visit Rockville?+
The most comfortable months at Rockville are March to November.
How do I get to Rockville?+
Open the directions link to navigate to 43.32366, -117.11969 in Google Maps. The nearest road is Succor Creek Road.

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