Mineral Stamps of the United States

1974: Mineral Heritage Issue. A set of four stamps.

Minerals Represented: Petrified wood, tourmaline, amethyst, and rhodochrosite.

1992: Minerals. A set of four stamps. Hand painted cachet by artist Marvel Houge. Numbered 2/5. The original artist for the stamps was Howard Koslow (1924-2016). His art is included in a set of stamps including these four minerals, from the Marshall Islands.

Minerals Represented: Azurite, variscite, wulfenite, and copper.

Azurite, variscite, wulfenite, copper