Old Quarry (Riverside): Axinite Rockhounding in Riverside County, California

Updated June 2026

Old Quarry (Riverside) is a mapped rockhounding spot in Riverside County, California. Reported finds include axinite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Riverside County
State: California
Nearest road: Sierra Avenue
Postcode: 92509
Coordinates: 34.01668, -117.41586

Geology at Old Quarry (Riverside)

This spot sits on ground mapped as Tonalite, undifferentiated that formed roughly 145 to 66 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit: Tonalite, undifferentiated
Age: 145–66 Ma (Cretaceous)
Elevation: 1,050 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 Old Quarry (Riverside)

Best months: October to June. Typical highs run 93°F in midsummer and 67°F in midwinter, with winter lows near 43°F.

Climate normals: NOAA 1991-2020 monthlies, RIVERSIDE MUNI AP station (5 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: April 1, 2026

BLM California, Recreational mineral collecting
California Geological Survey
CDFW, Suction Dredge Mining Permit Program
Community submissions reviewed against published agency rules

Found at Old Quarry (Riverside)

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

Axinite

Nearby rockhounding spots

Other rockhounding spots within driving distance of Old Quarry (Riverside).

Old Quarry (Riverside) FAQ

Where is Old Quarry (Riverside)?+

Old Quarry (Riverside) is in Riverside County, California, at 34.01668, -117.41586. Nearest road: Sierra Avenue.

What rocks and minerals can you find at Old Quarry (Riverside)?+

Old Quarry (Riverside) is reported to produce Axinite.

Is collecting allowed at Old Quarry (Riverside)?+

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.

What tools should I bring to Old Quarry (Riverside)?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Old Quarry (Riverside)?+

The most comfortable months at Old Quarry (Riverside) are October to June.

How do I get to Old Quarry (Riverside)?+

Open the directions link to navigate to 34.01668, -117.41586 in Google Maps. The nearest road is Sierra Avenue.

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Open Old Quarry (Riverside) on the map

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