Akermanite Kusaka K, Hagiya K, Ohmasa M, Okano Y, Mukai M, Iishi K, Haga N Physics and Chemistry of Minerals 28 (2001) 150-166 Determination of structures of Ca2CoSi2O7, Ca2MgSi2O7, and Ca2(Mg.55Fe.45)Si2O7 in incommensurate and normal phases and observation of diffuse streaks at high temperature Sample: T = 359.4 K Melilite group _database_code_amcsd 0008519 CELL PARAMETERS: 7.8387 7.8387 5.0072 90.000 90.000 90.000 SPACE GROUP: P-42_1m X-RAY WAVELENGTH: 1.541838 Cell Volume: 307.668 Density (g/cm3): 2.942 MAX. ABS. INTENSITY / VOLUME**2: 22.59257435 RIR: 2.500 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 15.99 9.54 5.5428 1 1 0 4 17.71 1.68 5.0072 0 0 1 2 21.05 7.26 4.2198 1 0 1 8 22.69 3.20 3.9193 2 0 0 4 23.95 11.45 3.7156 1 1 1 4 25.41 4.15 3.5056 2 1 0 8 28.93 23.05 3.0863 2 0 1 8 31.14 100.00 2.8717 2 1 1 8 32.30 3.94 2.7714 2 2 0 4 35.87 1.63 2.5036 0 0 2 2 36.24 16.23 2.4788 3 1 0 8 37.08 5.48 2.4248 2 2 1 4 37.72 6.44 2.3849 1 0 2 8 38.88 6.70 2.3165 3 0 1 8 39.50 2.72 2.2816 1 1 2 4 40.61 1.58 2.2215 3 1 1 8 44.47 13.23 2.0374 2 1 2 8 45.48 2.37 1.9942 3 2 1 8 46.33 5.86 1.9597 4 0 0 4 47.84 6.74 1.9012 4 1 0 8 49.03 4.12 1.8578 2 2 2 4 49.32 9.98 1.8476 3 3 0 4 51.41 9.43 1.7774 4 1 1 8 51.91 19.95 1.7615 3 1 2 8 52.19 6.27 1.7528 4 2 0 8 52.82 3.41 1.7334 3 3 1 4 55.02 1.16 1.6691 0 0 3 2 56.02 2.45 1.6415 3 2 2 8 57.68 1.79 1.5982 1 1 3 4 60.27 1.54 1.5356 2 0 3 8 61.54 4.47 1.5070 2 1 3 8 62.47 1.38 1.4866 3 3 2 4 63.28 2.80 1.4696 5 1 1 8 65.26 4.86 1.4298 2 2 3 4 66.47 2.72 1.4066 3 0 3 8 66.95 9.37 1.3977 5 2 1 8 67.61 3.03 1.3857 4 4 0 4 70.51 1.78 1.3355 4 4 1 4 70.93 1.45 1.3287 4 3 2 8 72.33 3.33 1.3065 6 0 0 4 73.49 1.16 1.2887 6 1 0 8 75.56 1.34 1.2584 5 2 2 8 75.85 4.62 1.2543 4 1 3 8 76.03 1.22 1.2518 0 0 4 2 76.30 1.08 1.2480 6 1 1 8 76.99 2.31 1.2385 3 3 3 4 79.70 2.06 1.2031 6 2 1 8 80.82 2.48 1.1892 5 4 1 8 81.22 1.33 1.1844 5 3 2 8 83.46 2.14 1.1582 6 0 2 8 84.85 1.57 1.1427 4 3 3 8 85.03 1.09 1.1408 2 2 4 4 85.97 2.57 1.1308 5 1 3 8 86.14 1.35 1.1289 3 0 4 8 87.25 1.24 1.1174 3 1 4 8 87.90 1.17 1.1108 6 2 2 8 89.29 1.23 1.0970 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.