Found 2 items, similar to Orthoclase.
English → English (WordNet) Definition: orthoclase orthoclase n : a white or colored monoclinic feldspar
English → English (gcide) Definition: Orthoclase Orthoclase \Or"tho*clase\, n. [Ortho- + Gr. ? to break.] (Min.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar. [1913 Webster]