plagioclase

(plā′jē ō klās′)

noun

any of a series of triclinic feldspars, ranging in composition from albite to anorthite and found in many rocks

Origin: Ger plagioklas < Gr plagios (see plagio-) + klasis, a cleaving, fracture < klaein, to break: see clastic

See plagioclase in American Heritage Dictionary 4

noun

Any of a common rock-forming series of triclinic feldspars, consisting of mixtures of sodium and calcium aluminum silicates. Also called oligoclase.

Origin:

Origin: Greek plagio-, plagio-

Origin: + Greek klasis, breaking (from its oblique cleavage) (from klān, to break)

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