Unnamed Location (Wonderstone rhyolite): Wonderstone Rhyolite Rockhounding in Lassen County, California
Updated June 2026
Unnamed Location (Wonderstone rhyolite) is a mapped rockhounding spot in Lassen County, California. Reported finds include wonderstone rhyolite. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing Unnamed Location (Wonderstone rhyolite) in Lassen County, California
Quick details
- Access
- Public area
- County
- Lassen County
- State
- California
- Nearest road
- County Road 8059
- Coordinates
- 41.03994, -120.78058
Geology at Unnamed Location (Wonderstone rhyolite)
This spot sits on pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range), mapped as andesite that formed roughly 28 to 2 million years ago. Volcanic ground like this weathers into rocky slopes and float, and fresh exposures in cuts and drainages are usually the most productive places to look.
- Mapped unit
- pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range)
- Age
- 28–2 Ma (Late Oligocene to Pleistocene)
- Rock types
- andesite
- Elevation
- 5,890 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 Unnamed Location (Wonderstone rhyolite)
Best months: March to November. Typical highs run 83°F in midsummer and 41°F in midwinter, with winter lows near 18°F.
Climate normals: NOAA 1991-2020 monthlies, ADIN RS station (14 mi away), adjusted for elevation.
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:
- BLM California — Recreational mineral collecting
- California Geological Survey
- CDFW — Suction Dredge Mining Permit Program
- Community submissions reviewed against published agency rules
Found at Unnamed Location (Wonderstone rhyolite)
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 Unnamed Location (Wonderstone rhyolite).
- Deep CreekModoc County, California · 43 mi awayAgate, Opalized Wood
- Glass MountainTop pick in CaliforniaSiskiyou County, California · 54 mi awayObsidian
- Fandango PassModoc County, California · 60 mi awayAgate, Chalcedony, Jasper
- Area around Goose LakeModoc County, California · 66 mi awayAgate, Chalcedony, Jasper
- Coffee CreekTrinity County, California · 100 mi awayAnthophyllite, Serpentine
- Golden Jubilee MineTrinity County, California · 104 mi awayLimonite, Quartz, Pyrite
- Jenny CreekSiskiyou County, California · 106 mi awayAgate, Carnelian, Petrified Wood
- Agate Area (Klamath River)Siskiyou County, California · 107 mi awayAgate, Bloodstone, Jasper
Across the state line from Unnamed Location (Wonderstone rhyolite)
Unnamed Location (Wonderstone rhyolite) is close enough to the California border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
- VyaWashoe County, Nevada · 65 mi awayCommon Opal, Obsidian
- Nellie SpringWashoe County, Nevada · 70 mi awayOpalite
- Dry CreekLake County, Oregon · 71 mi awayRed Jasper, Jasper, Quartz
- Smoke Creek DesertWashoe County, Nevada · 71 mi awayGold
- Crane MountainLake County, Oregon · 75 mi awayAgate, Jasper, Thundereggs
- GerlachWashoe County, Nevada · 78 mi awayAgate, Silicified Wood
Unnamed Location (Wonderstone rhyolite) FAQ
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More rockhounding in California
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