Abstract
Single crystals of MnSiO(SiO4) with the titanite structure together with MnSiO3 clinopyroxene were synthesized from a MnO-SiO2 oxide mixture at 1000 8C and 9.2 GPa in a multi-anvil press. The crystal structure of MnSi2O5 [space group C2/c, a 5 6.332(1) A, b 5 8.161(1) A, c 5 6.583(1) A, b 5 114.459(3)8, and V 5 309.66 A3] was refined at room temperature from single-crystal X-ray data to R1 5 2.23%. The monoclinic MnSi2O5 phase has the titanite aristotype structure and is similar to the monoclinic Ca-analogue CaSi2O5. Si occurs in compressed octahedral coordination, replacing Ti in titanite, and in tetrahedral coordination as an orthosilicate group. Mn has a distorted sevenfold coordination with MnO distances between 2.086 and 2.365 A.
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