Akermanite Yang H, Hazen R M, Downs R T, Finger L W Physics and Chemistry of Minerals 24 (1997) 510-519 Structural change associated with the incommensurate-normal phase transition in akermanite, Ca2MgSi2O7, at high pressure Sample: P = 0.80 GPa _database_code_amcsd 0008031 CELL PARAMETERS: 7.8154 7.8154 4.9919 90.000 90.000 90.000 SPACE GROUP: P-42_1m X-RAY WAVELENGTH: 1.541838 Cell Volume: 304.908 Density (g/cm3): 2.969 MAX. ABS. INTENSITY / VOLUME**2: 22.19843616 RIR: 2.434 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 16.04 9.62 5.5263 1 1 0 4 17.77 1.41 4.9919 0 0 1 2 21.12 7.17 4.2070 1 0 1 8 22.76 2.84 3.9077 2 0 0 4 24.02 11.27 3.7044 1 1 1 4 25.48 4.02 3.4952 2 1 0 8 29.02 23.07 3.0770 2 0 1 8 31.24 100.00 2.8631 2 1 1 8 32.40 3.80 2.7632 2 2 0 4 35.98 1.62 2.4959 0 0 2 2 36.35 16.37 2.4714 3 1 0 8 37.19 5.62 2.4175 2 2 1 4 37.84 6.26 2.3776 1 0 2 8 39.00 7.08 2.3095 3 0 1 8 39.62 2.48 2.2747 1 1 2 4 40.74 1.62 2.2149 3 1 1 8 44.61 12.64 2.0312 2 1 2 8 45.63 2.49 1.9882 3 2 1 8 46.48 5.89 1.9539 4 0 0 4 48.00 6.46 1.8955 4 1 0 8 49.19 4.07 1.8522 2 2 2 4 49.48 9.92 1.8421 3 3 0 4 51.58 9.10 1.7721 4 1 1 8 52.08 19.77 1.7562 3 1 2 8 52.35 5.95 1.7476 4 2 0 8 52.99 3.22 1.7282 3 3 1 4 56.21 2.32 1.6366 3 2 2 8 57.87 1.69 1.5933 1 1 3 4 60.47 1.37 1.5309 2 0 3 8 61.74 4.61 1.5024 2 1 3 8 62.68 1.28 1.4822 3 3 2 4 63.49 2.60 1.4652 5 1 1 8 65.48 4.68 1.4255 2 2 3 4 66.70 2.60 1.4023 3 0 3 8 67.17 8.94 1.3936 5 2 1 8 67.83 2.93 1.3816 4 4 0 4 70.76 1.66 1.3315 4 4 1 4 71.17 1.39 1.3247 4 3 2 8 72.58 3.12 1.3026 6 0 0 4 75.83 1.26 1.2546 5 2 2 8 76.12 4.08 1.2505 4 1 3 8 76.30 1.20 1.2480 0 0 4 2 76.57 1.06 1.2443 6 1 1 8 77.27 2.05 1.2348 3 3 3 4 79.99 1.82 1.1995 6 2 1 8 81.12 2.25 1.1856 5 4 1 8 81.51 1.13 1.1808 5 3 2 8 83.76 1.93 1.1548 6 0 2 8 85.17 1.39 1.1393 4 3 3 8 86.29 2.35 1.1273 5 1 3 8 86.46 1.21 1.1255 3 0 4 8 87.58 1.12 1.1140 3 1 4 8 88.24 1.03 1.1074 6 2 2 8 89.64 1.21 1.0937 5 2 3 8 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.