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Tetrataenite: FeNi
Comments: a) B&W reflected-light image of lightly etched tetraraenite (Tt), cloudy taenite (CT), and kamacite (K) and b) X-polarizer image showing unetched optical anisotropy and irregular crystals in the tetrataenite rim. Location: Estherville mesosiderite meteorite. AmMin v65:624. Scale: Scale Bar 50 µm. © American Mineralogist