Where to Find Chalcedony in Utah
Utah chalcedony shows up across the western deserts and the volcanic country of the Mineral Mountains and Wah Wah ranges. The Dugway geode beds in the Thomas Range yield hollow chalcedony nodules with quartz druse interiors, the best of them carrying blue and gray banding. The Black Rock Desert in Millard County produces small white and gray chalcedony rosettes weathered from rhyolite, and the Topaz Mountain area in Juab County turns up clear chalcedony coatings on the topaz-bearing tuff. Surface float of pale gray and white chalcedony is common on the dry lake margins south of Delta.
Spot list checked against source data on April 1, 2026.
Map of 25 chalcedony collecting spots in Utah
Standout chalcedony spots in Utah
Hand-picked from the full list below, with the reason each one earns a trip.
San Rafael Swell
Emery County 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.
Dugway Range
Juab County 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.
Spor Mountain
Juab County 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.
Topaz Dome Quarry
Juab County 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.
Best counties for chalcedony in Utah
Ranked by the number of mapped chalcedony spots. County links open the full rockhounding page for that county.
Every chalcedony spot we track in Utah
Sorted by county. Coordinates open in Google Maps.
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 Utah FAQ
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More minerals to hunt in Utah
Hunt chalcedony in Utah 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.
