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Frequencies (cm-1) : 115, 155, 171, 222, 299, 325, 371, 435, 542, 668, 965, 1042, 3639, 3654,
◻{CaNa}{Mg3Al2}(AlSi7O22)(OH)2
Sample : Retrogressed blueschist thin section.
Location : Europe, France, Armorican Massif, Bois-de-Céné,