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 = 3.79 GPa _database_code_amcsd 0008036 CELL PARAMETERS: 7.7494 7.7494 4.9328 90.000 90.000 90.000 SPACE GROUP: P-42_1m X-RAY WAVELENGTH: 1.541838 Cell Volume: 296.230 Density (g/cm3): 3.056 MAX. ABS. INTENSITY / VOLUME**2: 23.11884774 RIR: 2.463 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 16.18 9.69 5.4797 1 1 0 4 21.35 7.19 4.1613 1 0 1 8 22.95 2.64 3.8747 2 0 0 4 24.28 11.74 3.6662 1 1 1 4 25.71 3.80 3.4656 2 1 0 8 29.31 22.28 3.0471 2 0 1 8 31.55 100.00 2.8357 2 1 1 8 32.68 3.79 2.7398 2 2 0 4 36.43 1.50 2.4664 0 0 2 2 36.67 16.54 2.4506 3 1 0 8 37.55 6.35 2.3952 2 2 1 4 38.30 6.12 2.3502 1 0 2 8 39.37 7.05 2.2884 3 0 1 8 40.09 2.66 2.2491 1 1 2 4 41.13 1.70 2.1947 3 1 1 8 45.12 13.24 2.0095 2 1 2 8 46.07 2.94 1.9704 3 2 1 8 46.90 6.59 1.9374 4 0 0 4 48.43 6.56 1.8795 4 1 0 8 49.74 4.26 1.8331 2 2 2 4 49.93 10.36 1.8266 3 3 0 4 52.07 9.69 1.7563 4 1 1 8 52.65 21.33 1.7384 3 1 2 8 52.83 6.33 1.7328 4 2 0 8 53.50 3.43 1.7129 3 3 1 4 56.82 2.26 1.6204 3 2 2 8 58.62 1.64 1.5749 1 1 3 4 61.24 1.33 1.5136 2 0 3 8 62.52 5.32 1.4855 2 1 3 8 63.36 1.52 1.4679 3 3 2 4 64.12 2.48 1.4524 5 1 1 8 65.87 1.10 1.4179 4 2 2 8 66.30 5.03 1.4099 2 2 3 4 67.53 2.98 1.3871 3 0 3 8 67.84 9.93 1.3814 5 2 1 8 68.49 3.25 1.3699 4 4 0 4 71.47 1.66 1.3200 4 4 1 4 71.95 1.54 1.3123 4 3 2 8 73.29 3.49 1.2916 6 0 0 4 76.67 1.64 1.2429 5 2 2 8 77.06 4.35 1.2375 4 1 3 8 77.36 1.34 1.2335 6 1 1 8 77.38 1.42 1.2332 0 0 4 2 78.22 2.24 1.2221 3 3 3 4 80.83 1.91 1.1892 6 2 1 8 81.97 2.65 1.1754 5 4 1 8 82.44 1.15 1.1700 5 3 2 8 84.72 2.25 1.1442 6 0 2 8 86.24 1.60 1.1278 4 3 3 8 87.38 2.55 1.1161 5 1 3 8 87.69 1.22 1.1129 3 0 4 8 88.83 1.17 1.1016 3 1 4 8 89.26 1.23 1.0973 6 2 2 8 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.