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The crystal structure of a polycrystalline knorringite, Mg 3 (Cr 0.8 Mg 0.1 Si 0.1 ) 2 (SiO 4 ) 3 , synthesized at 11 GPa and T = 1500 °C in a multi-anvil press, has been refined from high-resolution synchrotron X-ray powder diffraction data. The structure is cubic, space group Ia3̅d, a = 11.5935(1) Å, V = 1558.27(4) Å 3 , D calc  = 3.79 g/cm 3 . The structural formula indicates that knorringite is susceptible to majorite substitution at these synthesis conditions. The Cr-O distance, 1.959(7) Å, is similar to that in Cr-bearing pyrope Mg 3 Al 2 (SiO 4 ) 3 . This confirms that the magnitude of the Cr-O distance is not responsible for the difference in crystal field splitting values between green knorringite and red Cr-pyrope. A comparison with the structure of other Cr-garnet end-members shows that the Cr-O distance and the  [4] Si-O-Cr angle decrease with decreasing synthesis pressure and with increasing X-cation size.

Structure refinement of a synthetic knorringite, Mg 3 (Cr 0.8 Mg 0.1 Si 0.1 ) 2 (SiO 4 ) 3