Where: Jalisco · North America · approx. 20.91, -103.98 (vicinity only)
Why this spot: Tertiary rhyolite
What turns up: Mexican fire opal (orange to red) and precious opal in seams and vugs of rhyolite.
Access: Permission required.
Worked opal mines around Magdalena on private and claim land; material bought from miners or mined by arrangement.
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.