Beta-diopside Plonka A M, Dera P, Irmen P, Rivers M L, Ehm L, Parise J B Geophysical Research Letters 39 (2012) L24307 Beta-diopside, a new ultrahigh-pressure polymorph of CaMgSi2O6 with six-coordinated silicon Note: P = 56.1 GPa Locality: synthesize from natural sample _database_code_amcsd 0020131 CELL PARAMETERS: 9.0530 7.6770 4.7510 90.000 96.340 90.000 SPACE GROUP: P2_1/c X-RAY WAVELENGTH: 1.541838 Cell Volume: 328.175 Density (g/cm3): 4.382 MAX. ABS. INTENSITY / VOLUME**2: 8.282735971 RIR: 0.615 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 9.83 3.35 8.9976 1 0 0 2 23.17 7.27 3.8385 0 2 0 2 23.36 3.07 3.8077 -1 1 1 4 25.09 23.25 3.5496 1 1 1 4 25.22 2.23 3.5306 1 2 0 4 28.34 16.48 3.1492 -2 1 1 4 30.62 28.38 2.9201 2 2 0 4 31.19 55.73 2.8674 2 1 1 4 32.04 14.54 2.7936 3 1 0 4 32.31 100.00 2.7706 1 2 1 4 34.95 27.37 2.5672 -2 2 1 4 35.62 35.90 2.5206 -3 1 1 4 36.50 2.64 2.4614 1 3 0 4 37.35 25.72 2.4075 2 2 1 4 38.08 2.91 2.3633 3 2 0 4 38.33 41.06 2.3482 -1 0 2 2 39.12 1.59 2.3028 3 1 1 4 40.08 29.00 2.2499 0 3 1 4 40.09 3.27 2.2494 4 0 0 2 40.56 1.14 2.2243 2 3 0 4 40.56 7.26 2.2242 1 0 2 2 40.83 1.98 2.2102 -1 3 1 4 41.17 4.59 2.1926 -2 0 2 2 41.20 65.06 2.1911 -3 2 1 4 41.85 9.47 2.1587 4 1 0 4 41.90 9.12 2.1561 1 3 1 4 42.90 5.49 2.1083 -2 1 2 4 44.04 14.11 2.0560 -2 3 1 4 44.25 6.53 2.0470 -4 1 1 4 44.33 15.04 2.0434 3 2 1 4 45.27 3.93 2.0031 -1 2 2 4 45.31 1.23 2.0016 2 0 2 2 46.05 18.60 1.9712 2 3 1 4 46.24 18.72 1.9635 -3 0 2 2 46.66 25.81 1.9467 3 3 0 4 46.91 5.01 1.9369 2 1 2 4 47.37 4.57 1.9193 0 4 0 2 47.77 1.47 1.9039 -2 2 2 4 47.81 2.00 1.9023 -3 1 2 4 48.50 1.09 1.8770 1 4 0 4 49.02 4.71 1.8584 -4 2 1 4 49.34 9.45 1.8470 -3 3 1 4 51.39 4.50 1.7780 0 4 1 4 51.49 1.17 1.7748 2 2 2 4 51.86 49.64 1.7629 3 0 2 2 52.01 14.03 1.7582 -1 4 1 4 52.08 11.63 1.7560 3 3 1 4 52.21 2.96 1.7520 5 1 0 4 52.34 10.08 1.7481 -3 2 2 4 52.67 1.16 1.7378 4 2 1 4 52.75 13.68 1.7352 0 3 2 4 52.92 3.51 1.7302 -1 3 2 4 53.04 2.20 1.7266 -4 0 2 2 53.32 4.01 1.7182 3 1 2 4 54.30 1.11 1.6895 4 3 0 4 54.47 4.43 1.6845 -4 1 2 4 54.72 1.48 1.6776 -2 4 1 4 55.16 5.94 1.6650 -2 3 2 4 56.29 12.22 1.6343 -4 3 1 4 57.53 1.77 1.6020 3 2 2 4 58.55 1.06 1.5766 2 3 2 4 59.31 2.01 1.5581 -3 4 1 4 59.63 16.60 1.5505 4 3 1 4 59.74 1.60 1.5479 -1 1 3 4 59.84 6.41 1.5456 4 0 2 2 60.00 1.04 1.5419 0 1 3 4 61.22 18.14 1.5141 -5 0 2 2 61.24 10.27 1.5135 1 5 0 4 61.87 3.93 1.4996 6 0 0 2 62.09 8.93 1.4948 5 2 1 4 62.17 6.02 1.4931 1 1 3 4 62.50 11.43 1.4860 -1 4 2 4 63.16 7.99 1.4720 5 3 0 4 63.74 6.27 1.4601 0 5 1 4 63.74 10.70 1.4600 4 4 0 4 63.93 34.90 1.4563 0 2 3 4 64.28 3.01 1.4491 -1 5 1 4 64.59 24.07 1.4428 -5 3 1 4 66.37 1.96 1.4085 -5 2 2 4 67.00 1.87 1.3968 6 2 0 4 68.00 3.36 1.3785 -6 2 1 4 68.67 9.39 1.3667 3 5 0 4 68.85 5.77 1.3638 6 1 1 4 69.97 14.43 1.3446 -1 3 3 4 70.17 1.06 1.3413 -4 1 3 4 70.26 2.27 1.3397 5 1 2 4 71.52 2.43 1.3193 -2 3 3 4 71.81 6.64 1.3146 -6 1 2 4 72.52 3.56 1.3035 6 2 1 4 72.85 1.30 1.2983 3 4 2 4 73.59 4.01 1.2872 0 5 2 4 73.81 7.80 1.2838 -4 2 3 4 73.90 3.67 1.2824 5 2 2 4 74.10 4.72 1.2795 0 6 0 2 74.12 5.77 1.2793 -6 3 1 4 74.91 1.41 1.2677 7 1 0 4 75.20 1.64 1.2636 1 5 2 4 75.50 2.61 1.2592 -7 1 1 4 75.61 1.15 1.2577 -2 5 2 4 76.57 1.23 1.2443 -4 5 1 4 77.25 1.78 1.2350 0 6 1 4 77.57 4.18 1.2307 2 6 0 4 77.75 4.19 1.2283 -1 6 1 4 78.48 1.55 1.2188 1 6 1 4 78.49 6.22 1.2186 6 3 1 4 78.51 4.21 1.2183 2 5 2 4 78.61 3.88 1.2170 0 4 3 4 79.06 4.02 1.2113 -7 2 1 4 79.75 1.70 1.2025 -4 3 3 4 79.87 1.85 1.2010 -2 4 3 4 80.57 3.88 1.1923 6 1 2 4 80.86 2.12 1.1887 -5 4 2 4 81.32 3.10 1.1832 3 3 3 4 81.32 2.63 1.1831 -6 3 2 4 81.40 1.08 1.1822 2 6 1 4 82.08 2.49 1.1741 -2 0 4 2 82.50 2.56 1.1692 4 2 3 4 82.71 1.75 1.1668 0 1 4 4 83.25 2.07 1.1606 -2 1 4 4 83.82 2.17 1.1541 1 0 4 2 84.16 4.07 1.1503 2 4 3 4 84.43 10.31 1.1474 -4 5 2 4 84.89 1.44 1.1423 -3 0 4 2 86.05 3.01 1.1299 -3 1 4 4 86.54 7.66 1.1247 8 0 0 2 86.65 1.10 1.1235 -1 6 2 4 87.69 3.09 1.1129 5 1 3 4 87.77 4.06 1.1121 2 0 4 2 88.07 5.61 1.1091 1 6 2 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.