Orthoclase

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]



From WordNet (r) 2.0 [wn]:

  orthoclase
       n : a white or colored monoclinic feldspar