2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
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}.
From WordNet r 1.6 [wn]:
orthoclase
n : a white or colored monoclinic feldspar
more about orthoclase
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