pla·gi·o·clase feldspar 
(plājē-ə-klās′, -klāz′, plăjē-)
(plājē-ə-klās′, -klāz′, plăjē-)n.
Any of a series of triclinic feldspars that are a common constituent of rocks, consisting primarily of a mixture of sodium aluminum silicate, NaAlSi3O8, and calcium aluminum silicate, CaAl2Si2O8.
[Greek plagio-, plagio- + Greek klasis, breaking (from its oblique cleavage) (from klān, to break).]
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