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Aspidolite: NaMg3AlSi3O10(OH)2
Comments: B&W thin section (PPL) of a clinopyroxene leuconorite showing Na-rich phlogopite surrounding corroded plagioclase (Pl). (AmMin, v86:29). Location: Gabbroic crustal zenoliths form Volcan San Pedro, Chilean Andes. Scale: See Image. © American Mineralogist