Where: Portugal · Europe · approx. 41.68, -7.67 (vicinity only)
Why this spot: Variscan vein
What turns up: Amethyst and smoky quartz in quartz veins of northern Portugal
Access: Gray area.
Rural vein ground; small-scale collecting on open land is tolerated, ask about private parcels.
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.