orthoclase


From The Collaborative International Dictionary of English v.0.48:

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]
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