The story
Named for Jean-Claude Guillemin (1923–1994), founder of the Service Géologique National of the Bureau de Recherches Géologiques et Minières: Guillemin + -ite.
Etymology from Wiktionary, CC BY-SA 4.0.
guilleminite
Today it means: An orthorhombic-pyramidal mineral containing barium, hydrogen, oxygen, selenium, and uranium. Full definition →