Mineral
Valentinita
Sb₂O₃ · Óxidos
Antimony oxide (Sb₂O₃), a dimorph of senarmontite. Much less common than the latter, it forms in oxidation zones of stibnite. It typically occurs as acicular or lamellar aggregates, white to yellowish, with silky to vitreous lustre.
Etymology
In honour of "Basilio Valentín" (Basil Valentine), a European alchemist.