West desert / Thomas Range
Topaz Mountain topaz, red beryl float (display only — claims are tight), bertrandite, opal, and bixbyite. Topaz Mountain has a permanent public collecting area.
Rockhounding in Utah
246 mapped spots across 29 counties. Utah has several well-known rockhounding areas close enough to build a trip around: Topaz Mountain, the Dugway geode beds, the San Rafael Swell, and the trilobite beds near Delta. Common targets include topaz, red beryl, geodes, trilobites, and septarian nodules.
Utah rockhounding photos
Representative spot and material photos from locations in this state, shown where verified public image records are available.
Map showing 246 rockhounding spots in Utah
Top minerals found in Utah
Counts reflect how many spots in this list mention each mineral.
- Pyrite53
- Galena49
- Malachite48
- Azurite42
- Limonite36
- Quartz33
- Gold31
- Cerussite29
- Gypsum29
- Chalcopyrite27
- Chalcedony25
- Garnet25
Notable areas: Dugway geodes, Topaz Mountain topaz, Brian Head agate, and the trilobite quarries near Delta are common Utah trip targets.
Geology behind Utah rockhounding
Utah collecting breaks into three broad regions: the Basin and Range west of I-15, the Colorado Plateau in the east and southeast, and the Uinta-Wasatch mountain belt. Topaz Mountain, Dugway, the Thomas Range, and the House Range sit in the west desert. The San Rafael Swell is known for septarian nodules, agatized dinosaur bone, and picture sandstone. The House Range Cambrian shales produce trilobites at U-Dig and Antelope Springs.
Best regions to focus your search
House Range / Millard County
Trilobites at U-Dig and Antelope Springs, brachiopods, snail-shell fossils. Pay-to-dig and remote BLM ground.
San Rafael Swell & southeast Utah
Septarian nodules, agatized dinosaur bone (gem-quality bone may require permits — check rules), Moqui marbles, picture sandstones.
Wasatch & Uinta mountains
Garnet schist, hot-springs travertine, mine dump material above Park City and Alta. Heavy snow into June.
Best season
April through June and September through October are the easiest months. July and August in the west desert often clear 100°F with no shade. Mountain locations can stay snowbound through May.
What to bring
Topaz Mountain in particular needs a 5-gallon bucket, 1/4-inch screen, geology pick, and patience for the heat. Trilobite digs supply hammers but bring safety glasses. Carry well more water than you think you'll need in the west desert.
Local collecting history
Topaz Mountain has been a public collecting area since the 1970s, when BLM designated parts of it for recreational rockhounding. Red beryl, also called bixbite, was first described from the Thomas Range and remains a rare Utah gemstone.
Rockhounding near major Utah cities
Day-trip range. Each section lists the closest mapped rockhounding spots within about 150 miles of the city — most are inside a 2 to 3 hour drive.
Rockhounding near Salt Lake City
See all →6 closest spots to Salt Lake City, UT.
- Arthur's ForkMorgan County · Biotite, Monazite14 mi18 min drive
- Carbonate Gem MinesSalt Lake County · Anglesite, Barite15 mi19 min drive
- Farmington mining districtDavis County · Azurite, Chalcopyrite16 mi19 min drive
- Big Cottonwood CanyonSalt Lake County · Azurite, Malachite16 mi20 min drive
- Great Salt LakeSalt Lake County · Aragonite, Bloedite16 mi20 min drive
- Little CottonwoodSalt Lake County · Apatite, Alunite16 mi20 min drive
Neighboring states with rockhounding
Geology rarely respects state borders. These states share mapped rockhounding country with Utah — useful when Utah is the start, not the whole trip. Each card links to the closest county across the line.
Rockhounding by county in Utah
County pages are linked once we have at least 3 mapped spots for a focused guide with coordinates, mineral notes, and nearby spots.
- San Juan County21 spotsTop: Carnotite, Azurite, Malachite
- Tooele County19 spotsTop: Galena, Pyrite, Cerussite
- Beaver County18 spotsTop: Pyrite, Quartz, Azurite
- Grand County15 spotsTop: Pyrolusite, Agate, Jasper
- Juab County15 spotsTop: Fluorite, Beryl, Pyrite
- Millard County15 spotsTop: Garnet, Chalcedony, Idocrase
- Emery County12 spotsTop: Carnotite, Agate, Chalcedony
- Box Elder County11 spotsTop: Chalcopyrite, Galena, Limonite
- Garfield County10 spotsTop: Agate, Gold, Monazite
- Sevier County10 spotsTop: Anhydrite, Gypsum, Limonite
- Kane County9 spotsTop: Anhydrite, Gypsum, Gold
- Iron County8 spotsTop: Anhydrite, Apatite, Chalcedony
- Piute County8 spotsTop: Alunite, Barite, Pyrolusite
- Salt Lake County8 spotsTop: Barite, Galena, Magnetite
- Sanpete County8 spotsTop: Anhydrite, Gypsum, Halite
- Uintah County8 spotsTop: Azurite, Malachite, Agate
- Utah County7 spotsTop: Calcite, Quartz, Sylvanite
- Cache County5 spotsTop: Galena, Cerussite, Malachite
- Duchesne County5 spotsTop: Fluorapatite, Wurtzilite, Albertite
- Wasatch County5 spotsTop: Albertite, Chabazite, Gold
- Washington County5 spotsTop: Agate, Aragonite, Calcite
- Wayne County5 spotsTop: Agate, Jasper, Petrified Wood
- Davis County4 spotsTop: Azurite, Malachite, Aragonite
- Rich County4 spotsTop: Phosphorite, Azurite, Barite
- Morgan County3 spotsTop: Biotite, Copper, Gold
- Weber County3 spotsTop: Malachite, Azurite, Cerussite
Top picks in Utah
10 best spotsHand-picked standouts from the Utah list, chosen for unusual mineralogy, documented public access, or both. Each card links to coordinates, access notes, and what to look for.
Top pickFrisco
PublicBeaver County
Frisco combines a major historic silver-lead camp with a long mineral list that includes copper carbonates, galena, sphalerite, pyrite, opal, and wulfenite. Mindat documents the San Francisco district's specimen minerals, while USGS mapping and Utah history sources place the locality in one of Beaver County's most important mining landscapes.
Azurite, Barite, Calamine, Chalcocite
Top pickSan Rafael Swell
PublicEmery County
The San Rafael Swell is a broad exposed anticline where Morrison, Curtis, and Cedar Mountain strata carry local agate, jasper, chalcedony, petrified wood, and dinosaur-bone material. BLM manages the Swell as a major public recreation area, and UGS describes the same formations as part of the area's collectible rock and mineral resource base.
Agatized Wood, Amethyst, Carnotite, Petrified Wood
Top pickDugway Range
PublicJuab County
The Dugway Geode Beds are one of Utah's clearest geology-to-specimen localities: Miocene rhyolite cavities were eroded by Lake Bonneville and redeposited as diggable geodes in lake sediments. BLM lists the beds as a rockhounding hotspot, and UGS notes that the geodes commonly contain clear, purple, or pink quartz.
Beryl, Chalcedony, Fluorite, Garnet
Top pickSpor Mountain
PublicJuab County
Spor Mountain stands out because its topaz-rhyolite-related deposits made it the world's premier beryllium district and Utah's largest fluorite producer. Mindat documents bertrandite, fluorite, chalcedony, opal, carnotite, hematite, magnetite, pyrite, quartz, and topaz across the district, which makes it more than a single-specimen stop.
Fluorite, Bertrandite, Carnotite, Chalcedony
Top pickTopaz Dome Quarry
PublicJuab County
Topaz Mountain is Utah's defining gem locality, where amber topaz crystals formed in cavities of the Topaz Mountain Rhyolite and commonly bleach colorless in sunlight. The BLM identifies the area as a public rockhound recreation site, while the Utah Geological Survey documents topaz, red beryl, amethyst, garnet, bixbyite, opal, and hematite in the same volcanic field.
Beryl, Calcite, Bixbyite, Carnelian
Top pickBlack Rock
PublicMillard County
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.
Snowflake Obsidian
- No photoTop pick
Marysville
PublicPiute County
Marysvale earns a top spot for small but well-formed crystals in rhyolite cavities, especially bixbyite, amethyst, and reported rutile or pseudobrookite. UGS describes the occurrence as BLM public land in a mid-Tertiary volcanic field, and Mindat records the same locality north of Marysvale with bixbyite, amethyst, pseudobrookite, and rutile.
Cinnabar, Alunite, Albite, Biotite
Top pickGold Hill
PublicTooele County
Gold Hill is one of Utah's most mineralogically varied old districts, with arsenic, gold, copper, lead, silver, tungsten, and zinc production tied to skarn, vein, and replacement deposits. UGS identifies it as Utah's leading historical producer of tungsten and arsenic, and Mindat records a broad suite of collectible secondary copper, lead, and zinc minerals around the district.
Azurite, Cerussite, Chalcopyrite, Chlorite
- No photoTop pick
Great Salt Lake
PublicTooele County
The Tooele side of Great Salt Lake offers an unusual sediment specimen rather than a hard-rock target: oolitic sand made of calcium-carbonate coats around tiny nuclei in shallow, wave-agitated brine. UGS documents accessible oolitic dunes on BLM public lands at Stansbury Island and explains that Great Salt Lake sand is often chemically grown in the lake rather than washed down as quartz grains.
Aragonite, Bloedite, Gypsum, Halite
- No photoTop pick
Hanksville
PublicWayne County
The Hanksville and Caineville stretch of Wayne County is a strong public-land agate and petrified-wood area because weathering has released chalcedony, chert, jasper, and silicified wood from Mesozoic sedimentary rocks. UGS describes BLM public land where specimens can be found close to the road, while Utah collecting rules make clear that petrified wood has personal-use limits and protected park or private lands must be avoided.
Agate, Jasper, Petrified Wood
Every rockhounding spot in Utah
Sorted by county. Tap coordinates to open in Google Maps, or open RockHoundR for the full map view with land overlays and weather.
Utah rockhounding FAQ
Is rockhounding legal in Utah?+
Yes on most BLM and SITLA land. Utah's five national parks (Arches, Bryce, Canyonlands, Capitol Reef, Zion), state parks, and tribal lands are closed. Always confirm rules at the local BLM field office — Grand Staircase-Escalante and Bears Ears have unit-specific restrictions.
Can I dig at Topaz Mountain?+
Yes. Topaz Mountain is a public BLM collecting area in the Thomas Range west of Delta. Hand digging in talus, screening, and small-scale picking are allowed. Bring a screen, a bucket, water, and sun protection — there is no shade.
Are gem-quality petrified bone and trilobites legal to keep?+
Trilobites and other invertebrate fossils are legal to keep in reasonable amounts on BLM land. Vertebrate fossils (including dinosaur bone) are federally protected — you may collect small amounts of common, non-gem petrified bone for personal use under BLM rules, but commercial collection and gem-grade bone usually require a permit.
What is the BLM rockhounding limit in Utah?+
Up to 25 pounds per day plus one piece, capped at 250 pounds per calendar year per person, for common rocks, mineral specimens, and semiprecious gemstones. Limits cannot be pooled between collectors.
Where can I dig for trilobites in Utah?+
U-Dig Fossils in the House Range (Millard County) is a popular pay-to-dig trilobite quarry. Antelope Springs is the public alternative on nearby BLM land, with similar Cambrian shale beds and free access.
Map every Utah spot in the app
Open the RockHoundR app to see Utah on a real map with public land overlays, weather, geology, and your saved finds.
