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Geologic sightseeing

Learn more about Oregon's geology

Gems and Minerals in Oregon

This volcanic glass can be collected in central Oregon at Glass Butte (a rockhounding site on BLM land) on Highway 20 between Bend and Burns. An enormous flow of obsidian can also be seen at Newberry Crater, south and east of Bend, but no collecting is permitted in this national monument.

Central Oregon Rockhounding Map (BLM)
Rockhounding on Public Land (BLM)

The edge of obsidian can be flaked
to one molecule in thickness, much sharper
than any knife or razor edge.

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Oregon Department of Geology and Mineral Industries
800 NE Oregon Street, Suite 965, Portland, OR 97232-2162
(971) 673-1555, FAX (971) 673-1562
email us at DOGAMI