Saint-Marcel manganese and copper mines

What you could find

Reported finds from this ground.

Nails and fittings

Crystals and minerals

Also reported: violan diopside, piemontite, rhodonite.

Photos via Wikimedia Commons: North Lincolnshire Museum, Martin Foreman, (CC BY 2.0), Stephanie Clifford from Arlington, VA, USA (CC BY 2.0).

Why this spot

Alpine ophiolite Mn and Cu deposits, source of classic violan and greenovite

Before you go

Hazards noted for this site.