psilomelane

== English == === Etymology === from Gr. ψιλός (naked, smooth, bald) and μέλας (black) === Noun === psilomelane (usually uncountable, plural psilomelanes) Any hard, black hydrous manganese oxide with variable amounts of barium and potassium. ==== Translations ==== === Further reading === David Barthelmy (1997–2026), “Psilomelane”, in Webmineral Mineralogy Database. “psilomelane”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.