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Suhailite: (NH4)Fe3(Si3Al)O10(OH)2
Comments: PPL thin-section showing unoriented grains of graphite-rich golden suhailite. Suh - suhalite, Ann - annite, Sil - sillimanite. (AmMin v94:211). Location: Betic Cordillera gneisses (Spain). Scale: See Image. © American Mineralogist