Where: California · North America · approx. 41.73, -120.37 (vicinity only)
Why this spot: Quaternary rhyolite
What turns up: Rainbow, silver-sheen and mahogany obsidian at the Modoc NF designated area
Access: Open / legal.
Modoc NF Rainbow Mine designated collecting area; hand collecting allowed.
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.