Richardson's Rock Ranch


For some great rock hunting, try Richardson's Rock Ranch, which offers free use of rock picks for the day. Although geologists disagree on how thundereggs are formed, they do agree that they are not actually rocks but nodules or geodes. While usually between two and six inches in diameter, some thundereggs have been found as large as a yard in diameter and weighing more than one ton. They generally are filled with chalcedony or opal, making them valuable prizes to jewelry makers as well as rockhounds. Richardson's is open 7 AM to 5 PM. They also offer a free campground with hookups.


Gateway Rt Box 440
Madras, OR 97741


44.71693200, -120.96682300
Visit Website
(541) 475-2680

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