Glass Mountain — Rockhounding in Siskiyou County, California
Glass Mountain represents California's northern volcanic-glass collecting better than any ordinary agate wash, with Forest Service materials identifying designated obsidian collecting areas in the Modoc country. Mindat's Siskiyou County records place Glass Mountain and Little Glass Mountain among mapped pumice and obsidian-related localities, tying the material directly to young Cascade volcanism. Reported finds include obsidian. Below: coordinates, access notes, nearby spots, and trip-planning links.
Glass Mountain photos
Public image records connected to this spot or its reported material, with source and license attribution.
Map showing Glass Mountain in Siskiyou County, California
Quick details
- Access
- Public area
- County
- Siskiyou County
- State
- California
- Coordinates
- 41.60153, -121.50444
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 Glass Mountain
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 Glass Mountain.
- Jenny CreekSiskiyou County, California · 53 mi awayAgate, Carnelian, Petrified Wood
- Agate Area (Klamath River)Siskiyou County, California · 54 mi awayAgate, Bloodstone, Jasper
- Unnamed Location (Wonderstone rhyolite)Lassen County, California · 54 mi awayWonderstone Rhyolite
- Area around Goose LakeModoc County, California · 61 mi awayAgate, Chalcedony, Jasper
- Deep CreekModoc County, California · 65 mi awayAgate, Opalized Wood
- Fandango PassModoc County, California · 68 mi awayAgate, Chalcedony, Jasper
- Hungry CreekSiskiyou County, California · 69 mi awayCassiterite, Copper
- Coffee CreekTrinity County, California · 72 mi awayAnthophyllite, Serpentine
Across the state line from Glass Mountain
Glass Mountain 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.
- Outlaw Rocks Mining CompanyKlamath County, Oregon · 51 mi away
- Quartz Mountain PassLake County, Oregon · 61 mi awayAgate, Chalcedony, Jasper
- Green Springs Mt.Jackson County, Oregon · 63 mi awayAgate Nodules, Carnelian, Chalcedony
- Crane MountainLake County, Oregon · 70 mi awayAgate, Jasper, Thundereggs
- LakeviewLake County, Oregon · 73 mi awayAgate, Jasper, Geode
- Warner CanyonLake County, Oregon · 76 mi awayPetrified Wood, Quartz
Glass Mountain FAQ
Why is Glass Mountain one of the best rockhounding spots in California?+
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More rockhounding in California
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