Ŏt'trel-īte, n.
(49), n. (Min.) A mineral of a dark grayish or greenish-gray color, consisting chiefly of silicate of alumina, iron, and manganese; — so called from Ottrez, on the borders of Luxembourg. Dana.
(49), n. (Min.) A mineral of a dark grayish or greenish-gray color, consisting chiefly of silicate of alumina, iron, and manganese; — so called from Ottrez, on the borders of Luxembourg. Dana.