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The crystal chemistry of viridines and kanonaite, (Al 1-x-y Mn 3  x  +  Fe 3  y  +  ) 2  (OǀSiO 4 ), has been evaluated with special reference to the behavior of Mn 3+  in this andalusite type structure. Five natural samples (from Ultevis:  x  = 0.012,  y  = 0.028; from Yakutia:  x  = 0.076,  y  = 0.046; from Tanzania:  x  = 0.091,  y  = 0.031; from Darmstadt:  x  = 0.171,  y  = 0.048; from Kanona:  x  = 0.340,  y  = 0.009) and two synthetic viridines ( P 135:  x  = 0.173,  y  = 0.005;  P 150:  x  = 0.22,  y  = 0) have been studied by means of X-ray powder diffraction, single crystal-structure refinements,  57 Fe  y -resonance spectroscopy, and optical absorption microspectroscopy.

zeitschrift für kristallographie - crystalline materials

The crystal chemistry of (Mn 3 + , Fe 3+ )-substituted andalusites (viridines and kanonaite), (Al 1−x−y Mn 3  x  + Fe 3  y  + ) 2  (OǀSiO 4 ): crystal structure refinements, Mössbauer, and polarized optical absorption spectra