Marcasite (?), n. [F. marcassite; cf. It. marcassita, Sp. marquesita, Pg. marquezita; all fr. Ar. marqashītha.] (Min.) A sulphide of iron resembling pyrite or common iron pyrites in composition, but differing in form; white iron pyrites.[1913 Webster]
Golden marcasite, tin. [Obs.][1913 Webster]