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A triclinic mineral, (Na,Ca)[(Si,Al)AlSi2 O8 ] , NaSi 50 to 70 mol %, CaAl 50 to 30 mol %; of the plagioclase series of the feldspar group with prismatic cleavage; white to gray; a common rock-forming mineral in andesites, differentiated gabbros, some anorthosites, and as detrital grains.
Source: Dictionary of Mining, Mineral, and Related Terms

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