Protopyroxene Yang H, Finger L W, Conrad P G, Prewitt C T, Hazen R M American Mineralogist 84 (1999) 245-256 A new pyroxene structure at high pressure: Single-crystal X-ray and Raman study of the Pbcn - P2_1cn phase transition in protopyroxene Sample at P = 4.22 GPa, (Mg1.54Li.23Sc.23)Si2O6 _database_code_amcsd 0002096 CELL PARAMETERS: 9.0877 8.7526 5.1531 90.000 90.000 90.000 SPACE GROUP: P2_1cn X-RAY WAVELENGTH: 1.541838 Cell Volume: 409.883 Density (g/cm3): 3.265 MAX. ABS. INTENSITY / VOLUME**2: 8.580326773 RIR: 0.856 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 14.05 4.70 6.3042 1 1 0 2 20.00 3.20 4.4406 0 1 1 4 20.29 15.58 4.3763 0 2 0 2 22.28 4.44 3.9898 1 1 1 4 26.73 3.66 3.3357 0 2 1 4 28.10 23.15 3.1759 2 1 1 4 28.31 26.36 3.1521 2 2 0 2 28.50 100.00 3.1314 1 2 1 4 31.25 70.58 2.8626 3 1 0 2 32.22 3.30 2.7779 1 3 0 2 33.32 70.15 2.6889 2 2 1 4 35.35 2.47 2.5389 0 3 1 4 35.89 7.44 2.5024 3 1 1 4 36.24 43.60 2.4788 1 0 2 2 36.75 32.47 2.4452 1 3 1 4 37.72 3.31 2.3850 1 1 2 4 39.67 1.81 2.2719 4 0 0 1 40.24 27.00 2.2413 2 0 2 2 40.71 21.44 2.2164 2 3 1 4 41.59 3.59 2.1712 2 1 2 4 44.81 4.16 2.0226 4 1 1 4 45.01 2.08 2.0141 0 4 1 4 45.47 1.69 1.9949 2 2 2 4 46.04 1.84 1.9715 2 4 0 2 46.16 12.97 1.9664 1 4 1 4 46.26 3.74 1.9626 3 0 2 2 46.68 16.69 1.9458 3 3 1 4 47.48 5.08 1.9151 3 1 2 4 48.17 1.98 1.8891 1 3 2 4 48.48 9.17 1.8778 4 2 1 4 49.50 8.55 1.8413 2 4 1 4 51.00 4.94 1.7908 3 2 2 4 51.34 4.38 1.7796 5 1 0 2 51.41 1.20 1.7774 2 3 2 4 53.29 6.80 1.7189 1 5 0 2 53.80 10.52 1.7041 4 0 2 2 54.17 10.79 1.6930 4 3 1 4 54.56 1.11 1.6821 5 1 1 4 54.73 1.88 1.6772 3 4 1 4 54.89 6.09 1.6727 4 1 2 4 55.43 1.14 1.6575 0 5 1 4 55.44 2.28 1.6573 1 1 3 4 56.06 4.28 1.6405 1 4 2 4 56.43 1.48 1.6306 1 5 1 4 57.65 19.96 1.5989 0 2 3 4 58.09 2.84 1.5879 4 2 2 4 58.57 3.13 1.5760 4 4 0 2 58.62 3.31 1.5748 1 2 3 4 58.99 1.96 1.5657 2 4 2 4 61.15 5.01 1.5156 3 5 0 2 61.19 4.99 1.5146 6 0 0 1 62.54 2.11 1.4852 5 0 2 2 62.77 11.79 1.4802 0 3 3 4 62.88 31.21 1.4779 5 3 1 4 63.12 2.55 1.4729 3 1 3 4 63.54 5.61 1.4643 5 1 2 4 63.69 1.42 1.4610 3 4 2 4 63.70 6.11 1.4610 1 3 3 4 63.80 16.20 1.4588 0 6 0 2 64.04 1.75 1.4541 3 5 1 4 65.25 5.74 1.4299 1 5 2 4 66.07 2.53 1.4140 3 2 3 4 67.95 1.16 1.3796 2 5 2 4 67.97 1.50 1.3791 6 2 1 4 69.58 6.59 1.3511 0 4 3 4 70.46 1.01 1.3364 1 4 3 4 70.85 7.51 1.3299 3 3 3 4 72.33 1.46 1.3064 3 5 2 4 72.37 5.07 1.3057 6 0 2 2 72.69 16.09 1.3007 6 3 1 4 73.06 1.16 1.2951 2 4 3 4 73.30 9.23 1.2914 6 1 2 4 73.78 2.53 1.2842 7 1 0 2 74.37 3.37 1.2755 1 0 4 2 74.44 1.62 1.2745 0 1 4 4 75.29 2.35 1.2622 1 1 4 4 75.39 1.39 1.2608 5 5 0 2 75.64 9.40 1.2572 1 6 2 4 76.92 2.68 1.2394 2 0 4 2 77.84 3.20 1.2272 2 1 4 4 78.18 3.76 1.2226 2 6 2 4 78.30 4.05 1.2211 4 5 2 4 78.76 2.24 1.2150 1 5 3 4 80.55 1.01 1.1925 2 2 4 4 82.10 1.28 1.1739 2 7 1 4 84.39 1.46 1.1477 5 3 3 4 84.71 1.56 1.1443 3 2 4 4 85.48 1.04 1.1360 8 0 0 1 85.80 3.67 1.1325 5 5 2 4 87.82 1.29 1.1116 4 1 4 4 88.16 3.82 1.1082 4 6 2 4 89.03 1.84 1.0996 6 2 3 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.