Best spot

Black Rock — Rockhounding in Millard County, Utah

Black Rock is Utah's standout obsidian stop, with black, reddish-brown, and snowflake obsidian weathering from young rhyolitic volcanic rocks in the Black Rock Desert. UGS places the Black Spring collecting area on BLM public land and ties the glass to eruptions that also produced rhyolite and pumice in western Millard County. Reported finds include snowflake obsidian. Below: coordinates, access notes, nearby spots, and trip-planning links.

Black Rock photos

Public image records connected to this spot or its reported material, with source and license attribution.

3 photos

Quick details

Access: Public area
County: Millard County
State: Utah
Coordinates: 38.71904, -112.98712

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

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: April 1, 2026

BLM Utah — Rockhounding overview
Utah Geological Survey — collecting guidelines
SITLA — surface use rules
Community submissions reviewed against published agency rules

Found at Black Rock

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

Snowflake ObsidianEncyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Black Rock.

Across the state line from Black Rock

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

Snake RangeWhite Pine County, Nevada · 68 mi awaySilver, Tungsten

Black Rock FAQ

Why is Black Rock one of the best rockhounding spots in Utah?+

Where is Black Rock?+

Black Rock is in Millard County, Utah, at 38.71904, -112.98712.

What rocks and minerals can you find at Black Rock?+

Black Rock is reported to produce Snowflake Obsidian.

Is collecting allowed at Black Rock?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

How do I get to Black Rock?+

Open the directions link to navigate to 38.71904, -112.98712 in Google Maps. Some spots are remote — check road conditions before driving out.

More rockhounding in Utah

See all 246 Utah spots →

Open Black Rock on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.