Boric acid, or sassolite, is found mainly in its free state in some volcanic districts, for example, in the Italian region of Tuscany, the Lipari Islands and the US state of Nevada.
Asam borat, atau sasolit, ditemukan dalam keadaan bebas di beberapa distrik vulkanik, misalnya, di wilayah Tuscany Italia, Kepulauan Lipari dan negara bagian Amerika Serikat Nevada.