The quartz-galena-chalcopyrite vein
Olgas Mine, Castelo Branco, Mogadouro, Bragança, Portugal
Just above the entrance is possible to see the mineralized vein (brecciated quartz with galena, chalcopyrite and minor pyrite, pyrrhoytite, etc...).
The secondary copper minerals are well visible, mostly malachite, brochantite (and maybe other Cu sulfates), chrysocolla and azurite (also linarite).
Secondary lead minerals: cerussite/anglesite and ...
© Pedro Alves