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 = 9.98 GPa, (Mg1.54Li.23Sc.23)Si2O6 _database_code_amcsd 0002099 CELL PARAMETERS: 8.9921 8.6310 5.0659 90.000 90.000 90.000 SPACE GROUP: P2_1cn X-RAY WAVELENGTH: 1.541838 Cell Volume: 393.169 Density (g/cm3): 3.404 MAX. ABS. INTENSITY / VOLUME**2: 8.116707083 RIR: 0.776 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 14.22 5.10 6.2268 1 1 0 2 20.33 4.87 4.3689 0 1 1 4 20.58 15.86 4.3155 0 2 0 2 22.63 4.75 3.9297 1 1 1 4 27.14 3.22 3.2851 0 2 1 4 28.49 23.35 3.1333 2 1 1 4 28.67 24.09 3.1134 2 2 0 2 28.94 100.00 3.0856 1 2 1 4 31.60 77.07 2.8315 3 1 0 2 32.68 2.48 2.7402 1 3 0 2 33.79 78.42 2.6525 2 2 1 4 35.90 3.73 2.5017 0 3 1 4 36.35 8.74 2.4716 3 1 1 4 36.87 50.43 2.4381 1 0 2 2 37.31 37.34 2.4102 1 3 1 4 38.36 4.36 2.3463 1 1 2 4 40.11 2.52 2.2480 4 0 0 1 40.75 1.17 2.2142 3 2 1 4 40.89 28.46 2.2068 2 0 2 2 41.30 26.31 2.1861 2 3 1 4 42.27 3.66 2.1381 2 1 2 4 45.37 5.15 1.9989 4 1 1 4 45.70 1.86 1.9852 0 4 1 4 46.20 1.86 1.9648 2 2 2 4 46.69 2.33 1.9453 2 4 0 2 46.87 12.96 1.9385 1 4 1 4 46.97 5.33 1.9347 3 0 2 2 47.33 19.60 1.9206 3 3 1 4 48.20 5.47 1.8878 3 1 2 4 48.97 1.81 1.8600 1 3 2 4 49.11 9.26 1.8552 4 2 1 4 50.24 9.57 1.8160 2 4 1 4 51.79 5.00 1.7654 3 2 2 4 51.94 4.32 1.7606 5 1 0 2 54.10 6.22 1.6952 1 5 0 2 54.58 11.13 1.6813 4 0 2 2 54.91 12.17 1.6721 4 3 1 4 55.23 1.73 1.6630 5 1 1 4 55.52 2.26 1.6551 3 4 1 4 55.70 7.35 1.6503 4 1 2 4 56.30 1.44 1.6339 0 5 1 4 56.46 2.64 1.6298 1 1 3 4 56.99 3.47 1.6158 1 4 2 4 57.31 1.45 1.6076 1 5 1 4 58.51 1.47 1.5775 5 2 1 4 58.71 17.99 1.5725 0 2 3 4 58.96 2.60 1.5666 4 2 2 4 59.37 2.96 1.5567 4 4 0 2 59.44 1.33 1.5549 2 1 3 4 59.69 4.48 1.5490 1 2 3 4 59.96 1.85 1.5428 2 4 2 4 61.91 5.35 1.4987 6 0 0 1 62.04 7.27 1.4959 3 5 0 2 63.43 2.74 1.4664 5 0 2 2 63.73 34.90 1.4603 5 3 1 4 63.92 18.19 1.4563 0 3 3 4 64.22 2.67 1.4503 3 1 3 4 64.45 5.51 1.4457 5 1 2 4 64.71 1.70 1.4404 3 4 2 4 64.81 19.35 1.4385 0 6 0 2 64.86 5.53 1.4376 1 3 3 4 65.01 1.29 1.4346 3 5 1 4 66.35 6.38 1.4088 1 5 2 4 67.23 4.34 1.3925 3 2 3 4 67.62 1.40 1.3854 2 3 3 4 68.86 1.56 1.3635 6 2 1 4 69.08 1.55 1.3597 2 5 2 4 70.86 6.17 1.3298 0 4 3 4 71.08 1.31 1.3263 4 4 2 4 71.75 1.50 1.3155 1 4 3 4 72.11 6.72 1.3099 3 3 3 4 73.41 6.82 1.2898 6 0 2 2 73.53 1.71 1.2880 3 5 2 4 73.69 17.68 1.2856 6 3 1 4 74.36 9.29 1.2757 6 1 2 4 74.39 1.02 1.2752 2 4 3 4 74.71 2.65 1.2706 7 1 0 2 75.86 3.27 1.2541 1 0 4 2 75.94 2.10 1.2531 0 1 4 4 76.49 1.42 1.2454 5 5 0 2 76.80 1.83 1.2411 1 1 4 4 76.96 9.20 1.2389 1 6 2 4 78.46 1.95 1.2190 2 0 4 2 78.72 1.13 1.2156 3 4 3 4 79.39 4.48 1.2071 2 1 4 4 79.54 3.49 1.2051 2 6 2 4 79.59 4.28 1.2044 4 5 2 4 80.24 2.07 1.1964 1 5 3 4 80.96 1.03 1.1875 1 7 1 4 83.51 1.46 1.1576 2 7 1 4 85.87 1.13 1.1318 5 3 3 4 86.40 1.65 1.1262 3 2 4 4 86.61 1.17 1.1240 8 0 0 1 87.23 3.40 1.1176 5 5 2 4 89.55 1.36 1.0945 4 1 4 4 89.71 4.01 1.0930 4 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.