1957 Louis J. Thénard (1777-1857). The mineral thénardite was named by J.L. Casaseca in 1826 and published both in French and English. In both articles, the mineral name was without the accent mark, even though the family name Thénard is spelled with an accent. Casaseca was a professor of chemistry at the university of Madrid (Spain), and he named the mineral after his teacher and mentor Louis Jacques Thénard (1777-1857), Professor of Chemistry, University of Paris (France). (per Mindat).



1986 Minerals.
Issued September. No watermark. Engraving: Imprimerie des Timbres Poste. Paris. Perforation: 12½ x 12¼.
Minerals represented: Calcite, fluorite, marcasite, and quartz.

2016 The Mineral World.
Issued in January. No watermark. Design: Sylvie Patte and Tanguy Besset. Engraving: Carnet de 12 timbres autocollants. Perforation: 11.
Minerals represented: Gold, labradorite, olivine, quartz, sulphur, corundum (ruby), topaz (missing), amethyst (missing), turquoise, fluorite, silver, and copper.

