Hypertext Webster Gateway: "orthoclase"
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) 1.7 (wn)
orthoclase
n : a white or colored monoclinic feldspar
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