Colemanite (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite.
It was named after William Tell Coleman (1824-1893), owner of the mine Harmony Borax Works near Furnace Creek in Death Valley where it was first found in 1884.
colemanite in French: Colémanite
colemanite in Italian: Colemanite
colemanite in Polish: Colemanit
colemanite in Ukrainian: Колеманіт