Mineral Stamps from Portugal

1971: 1st Congress Hispano-Luso-American Economic Geology series. A set of four stamps.

Minerals represented: Wolframite, arsenopyrite, beryl, and chalcopyrite with sphalerite.

Wolframite, arsenopyrite, beryl, and chalcopyrite with sphalerite

1977: Subsoil – Cycle of Natural Resources series. A set of four stamps, pyrite (see below), marble, iron ore (see below), and uranium ore.