Aenigmatite Gasparik T, Parise J B, Reeder R J, Young V G, Wilford W S American Mineralogist 84 (1999) 257-266 Composition, stability, and structure of a new member of the aenigmatite group, Na2Mg4+xFe2-2xSi6+xO20, synthesized at 13-14 GPa _database_code_amcsd 0002100 CELL PARAMETERS: 10.3280 10.7240 8.8050 105.150 96.850 125.470 SPACE GROUP: P-1 X-RAY WAVELENGTH: 1.541838 Cell Volume: 719.667 Density (g/cm3): 3.335 MAX. ABS. INTENSITY / VOLUME**2: 2.484675668 RIR: 0.243 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 11.09 42.39 7.9783 0 0 1 2 11.10 33.75 7.9707 0 1 0 2 11.21 10.83 7.8960 1 0 0 2 12.07 5.92 7.3337 0 -1 1 2 12.77 2.54 6.9324 -1 0 1 2 14.09 6.54 6.2870 1 -1 1 2 17.60 1.66 5.0387 1 -2 1 2 18.61 8.34 4.7692 -1 -1 1 2 19.04 3.53 4.6616 -2 2 0 2 19.04 4.06 4.6609 -2 1 1 2 20.42 4.46 4.3492 0 -1 2 2 20.44 5.84 4.3455 0 -2 1 2 21.38 39.00 4.1560 2 -2 1 2 21.40 32.68 4.1528 -2 0 1 2 22.29 2.86 3.9892 0 0 2 2 22.31 3.60 3.9854 0 2 0 2 23.07 1.24 3.8548 -1 -1 2 2 23.83 8.71 3.7334 1 -2 2 2 24.27 60.13 3.6668 0 -2 2 2 25.84 28.18 3.4475 -2 1 2 2 25.85 33.02 3.4469 -2 3 0 2 26.08 10.16 3.4166 -3 2 0 2 26.98 6.78 3.3048 1 1 1 2 27.49 8.99 3.2442 -3 1 1 2 28.33 9.01 3.1503 1 0 2 2 28.83 63.60 3.0965 0 1 2 2 28.85 68.12 3.0952 0 2 1 2 28.86 1.52 3.0941 1 -3 2 2 29.42 1.06 3.0361 3 -2 1 2 29.50 1.64 3.0278 -1 -2 2 2 30.11 7.71 2.9682 3 -3 1 2 30.13 3.28 2.9665 2 -3 2 2 30.15 4.16 2.9642 -2 -1 2 2 30.51 22.95 2.9295 -2 2 2 2 30.52 22.60 2.9290 -2 3 1 2 30.79 61.44 2.9042 0 -1 3 2 30.82 50.65 2.9013 0 -3 1 2 30.92 7.62 2.8922 1 2 0 2 31.01 19.49 2.8839 2 -1 2 2 31.04 23.61 2.8814 2 1 0 2 31.63 22.47 2.8285 -3 3 1 2 31.92 1.06 2.8037 0 -2 3 2 32.38 25.24 2.7646 -1 2 2 2 32.82 19.34 2.7289 -3 2 2 2 32.90 47.74 2.7222 3 -1 1 2 33.52 100.00 2.6736 -2 0 3 2 33.53 91.65 2.6730 2 -4 1 2 33.56 23.35 2.6706 -1 3 1 2 33.70 5.37 2.6594 0 0 3 2 33.72 6.49 2.6580 -3 0 2 2 33.73 5.38 2.6569 0 3 0 2 34.06 28.33 2.6320 3 0 0 2 34.40 4.73 2.6069 1 -1 3 2 35.09 12.30 2.5574 -3 4 0 2 35.18 9.56 2.5511 -2 1 3 2 35.20 8.91 2.5499 -2 4 0 2 35.34 1.12 2.5396 -4 2 1 2 35.38 4.42 2.5369 1 -3 3 2 35.62 98.21 2.5206 -4 2 0 2 35.64 72.15 2.5194 2 -4 2 2 35.64 68.45 2.5188 -2 -1 3 2 35.76 15.45 2.5107 -1 1 3 2 36.24 13.98 2.4790 3 -2 2 2 36.56 5.49 2.4581 -4 3 1 2 36.77 5.68 2.4446 0 -3 3 2 37.15 14.31 2.4199 2 0 2 2 37.17 16.78 2.4190 2 1 1 2 37.68 5.50 2.3871 2 -3 3 2 37.72 4.33 2.3846 -2 -2 2 2 37.73 2.11 2.3844 4 -3 1 2 37.73 37.47 2.3842 2 -2 3 2 37.75 1.67 2.3832 -4 1 1 2 37.78 37.79 2.3814 -2 -2 1 2 38.02 2.20 2.3667 3 -4 2 2 38.27 10.46 2.3521 -3 1 3 2 38.63 5.70 2.3308 -4 4 0 2 38.63 5.51 2.3305 -4 2 2 2 38.70 3.29 2.3267 -1 -3 1 2 38.92 8.99 2.3138 -1 4 0 2 39.37 5.79 2.2885 -3 -1 1 2 39.39 12.81 2.2872 4 -2 1 2 39.41 12.31 2.2865 -4 1 0 2 41.02 8.93 2.2003 2 -4 3 2 41.05 9.74 2.1989 -2 -2 3 2 41.11 1.76 2.1956 -4 4 1 2 41.52 2.29 2.1750 -1 -3 3 2 41.53 7.35 2.1746 0 -2 4 2 41.56 7.87 2.1727 0 -4 2 2 41.96 3.19 2.1533 0 -1 4 2 42.00 2.89 2.1510 0 -4 1 2 42.19 6.02 2.1419 3 -5 1 2 42.76 5.89 2.1146 -1 0 4 2 42.83 1.01 2.1115 -1 -2 4 2 42.93 2.45 2.1069 -3 -1 3 2 43.17 2.27 2.0957 3 -3 3 2 43.20 71.00 2.0943 -2 0 4 2 43.22 72.92 2.0933 2 -5 1 2 43.22 2.47 2.0933 4 -3 2 2 43.25 4.01 2.0916 -4 0 1 2 43.55 10.17 2.0780 4 -4 2 2 43.59 9.40 2.0764 -4 0 2 2 44.17 68.24 2.0503 4 -1 1 2 44.19 2.50 2.0494 -5 3 1 2 44.26 2.87 2.0466 0 -3 4 2 44.28 3.25 2.0457 0 -4 3 2 45.78 18.54 1.9818 -2 1 4 2 45.81 18.89 1.9806 -2 5 0 2 45.89 1.66 1.9776 1 2 2 2 45.95 5.73 1.9751 4 -2 2 2 45.98 4.61 1.9740 4 0 0 2 46.41 2.24 1.9567 -5 2 0 2 46.50 21.08 1.9528 -4 4 2 2 46.71 3.49 1.9447 -3 0 4 2 46.90 3.14 1.9373 4 -5 2 2 46.92 3.46 1.9363 -4 0 3 2 47.12 4.21 1.9289 2 -3 4 2 47.17 4.72 1.9266 -2 -3 2 2 47.28 3.22 1.9226 1 -5 1 2 47.40 1.32 1.9180 -1 -3 4 2 47.49 1.27 1.9145 3 0 2 2 47.67 2.15 1.9079 -3 -2 2 2 48.22 1.35 1.8873 3 -5 3 2 48.22 7.63 1.8871 -4 3 3 2 48.23 7.47 1.8869 -4 5 1 2 48.29 6.29 1.8848 0 2 3 2 48.30 5.92 1.8843 0 3 2 2 48.34 4.28 1.8829 2 -2 4 2 48.36 1.28 1.8821 3 1 1 2 48.40 2.64 1.8807 -2 -3 1 2 50.27 1.03 1.8149 -5 4 2 2 51.07 3.57 1.7883 -2 2 4 2 51.09 1.19 1.7877 -5 5 1 2 51.10 4.18 1.7874 -2 5 1 2 51.36 4.22 1.7791 4 -1 2 2 51.37 3.30 1.7786 4 0 1 2 51.43 2.54 1.7769 5 -4 2 2 51.58 1.67 1.7718 0 1 4 2 51.73 2.87 1.7671 3 -6 2 2 51.81 1.08 1.7646 -1 3 3 2 52.14 1.15 1.7541 -4 -1 3 2 52.21 1.49 1.7519 -1 -1 5 2 52.30 1.37 1.7492 2 -1 4 2 52.36 1.43 1.7475 2 3 0 2 52.48 2.45 1.7435 3 2 0 2 52.56 3.47 1.7412 3 -4 4 2 52.70 1.60 1.7368 -5 3 3 2 52.74 1.25 1.7357 3 -3 4 2 53.14 5.40 1.7235 2 -5 4 2 53.17 6.83 1.7226 -2 -3 4 2 53.38 3.84 1.7162 -2 -1 5 2 53.41 4.17 1.7154 2 -6 2 2 53.65 1.95 1.7083 -6 4 0 2 53.66 1.97 1.7081 -6 3 1 2 53.78 6.75 1.7045 0 -1 5 2 53.84 5.79 1.7027 0 -5 1 2 53.95 1.30 1.6997 1 -5 4 2 54.14 1.71 1.6941 -4 4 3 2 54.14 1.23 1.6939 -4 5 2 2 54.18 1.96 1.6930 -1 2 4 2 54.64 3.89 1.6798 -5 0 2 2 55.33 5.23 1.6605 -6 5 0 2 55.34 4.07 1.6602 -6 3 2 2 55.56 6.54 1.6541 3 -2 4 2 55.61 3.66 1.6528 2 1 3 2 55.62 4.08 1.6524 2 2 2 2 56.16 1.80 1.6377 -6 2 1 2 56.50 7.69 1.6286 -6 5 1 2 56.51 8.15 1.6285 -6 4 2 2 56.52 1.57 1.6282 -1 5 1 2 56.61 1.19 1.6260 -5 0 3 2 56.75 1.07 1.6221 -6 2 2 2 57.18 2.04 1.6111 -3 -1 5 2 57.31 19.71 1.6075 -2 1 5 2 57.35 17.55 1.6065 0 -4 5 2 57.36 19.87 1.6064 -2 6 0 2 57.38 16.24 1.6060 0 -5 4 2 57.68 1.85 1.5983 1 -6 2 2 58.02 3.73 1.5897 -3 -3 3 2 58.12 1.33 1.5873 6 -3 1 2 58.13 1.03 1.5870 -6 2 0 2 58.26 13.50 1.5836 0 3 3 2 58.38 4.48 1.5806 5 -5 3 2 58.44 1.77 1.5792 5 0 0 2 58.74 1.08 1.5718 4 -4 4 2 58.81 1.59 1.5701 -4 -2 2 2 58.92 20.58 1.5675 4 0 2 2 59.38 3.61 1.5564 -3 -3 1 2 59.47 1.10 1.5543 4 -5 4 2 59.82 18.65 1.5460 6 -6 1 2 59.84 19.53 1.5455 -6 2 3 2 59.92 2.06 1.5437 2 -2 5 2 60.00 2.27 1.5419 -2 -4 1 2 60.37 1.21 1.5332 4 -1 3 2 60.40 1.15 1.5325 4 1 1 2 60.60 2.91 1.5280 5 -3 3 2 60.64 1.28 1.5272 -6 1 2 2 60.71 1.05 1.5256 4 -7 1 2 60.78 1.21 1.5240 -4 0 5 2 61.04 1.19 1.5180 6 -4 2 2 61.07 1.02 1.5175 -3 -3 4 2 61.08 1.24 1.5172 -6 1 1 2 61.17 1.20 1.5151 2 -5 5 2 62.10 44.53 1.4947 -4 5 3 2 62.59 45.55 1.4841 6 -6 2 2 62.63 44.87 1.4833 -6 1 3 2 62.63 6.90 1.4833 4 -6 4 2 62.68 7.51 1.4821 -4 -2 4 2 62.89 3.81 1.4778 -2 2 5 2 62.93 3.40 1.4769 -2 6 1 2 63.03 1.68 1.4749 3 -7 3 2 63.27 2.22 1.4698 4 -7 3 2 63.29 2.30 1.4695 -4 -1 5 2 63.42 40.97 1.4667 0 -5 5 2 63.44 2.55 1.4662 -1 -2 6 2 63.51 6.15 1.4648 -4 4 4 2 63.52 2.47 1.4645 -5 -1 1 2 63.53 6.40 1.4645 -4 6 2 2 63.63 2.02 1.4624 3 -3 5 2 63.75 1.98 1.4599 3 -5 5 2 63.82 2.09 1.4585 -7 4 0 2 64.25 7.31 1.4497 0 -3 6 2 64.31 8.03 1.4485 0 -6 3 2 64.36 50.67 1.4476 2 -1 5 2 64.43 54.85 1.4461 2 4 0 2 64.53 2.07 1.4441 -7 3 1 2 65.85 1.44 1.4183 -6 7 0 2 65.86 1.16 1.4182 -6 3 4 2 65.90 1.18 1.4173 7 -5 1 2 66.02 3.75 1.4151 3 1 3 2 66.72 1.30 1.4019 0 -4 6 2 66.73 1.68 1.4018 3 2 2 2 66.90 2.32 1.3985 6 -7 2 2 66.93 2.76 1.3980 -6 1 4 2 66.94 1.11 1.3978 5 -4 4 2 67.00 1.04 1.3968 3 -7 4 2 67.63 1.52 1.3853 6 -6 3 2 67.68 2.19 1.3843 -6 0 3 2 68.04 4.32 1.3779 6 -4 3 2 68.10 4.18 1.3769 -6 0 1 2 68.80 2.12 1.3645 -6 4 4 2 68.81 2.39 1.3644 -6 7 1 2 68.91 1.10 1.3627 4 -4 5 2 69.00 1.07 1.3611 -4 -3 2 2 69.17 1.11 1.3582 2 -4 6 2 69.25 1.83 1.3567 -2 -5 3 2 69.25 1.44 1.3567 -3 -2 6 2 69.55 2.07 1.3517 0 3 4 2 69.56 2.00 1.3515 0 4 3 2 69.71 1.60 1.3489 1 -7 3 2 70.02 1.96 1.3437 -3 -4 4 2 70.06 1.04 1.3430 5 -3 4 2 70.14 1.18 1.3417 7 -3 1 2 70.49 1.46 1.3359 -2 3 5 2 70.53 1.40 1.3353 -2 6 2 2 70.65 8.66 1.3333 4 -6 5 2 70.73 7.34 1.3320 -4 -3 4 2 70.74 1.04 1.3318 1 1 5 2 70.82 3.84 1.3304 -7 6 2 2 70.86 1.54 1.3298 6 -7 3 2 70.87 1.22 1.3297 1 -1 6 2 70.90 2.48 1.3292 7 -7 1 2 70.91 1.69 1.3290 -6 0 4 2 70.92 7.21 1.3288 2 0 5 2 70.99 6.90 1.3278 2 4 1 2 71.09 1.16 1.3261 -5 -2 2 2 71.49 2.17 1.3196 -7 5 3 2 71.54 1.07 1.3188 -4 -3 1 2 71.67 1.28 1.3168 6 -3 3 2 71.77 9.18 1.3153 -4 5 4 2 71.78 8.99 1.3151 -4 6 3 2 71.85 7.67 1.3139 -4 -1 6 2 72.82 1.25 1.2988 -7 7 1 2 73.10 1.63 1.2945 3 -7 5 2 73.34 2.29 1.2909 -1 4 4 2 73.46 1.23 1.2890 1 5 1 2 74.01 2.78 1.2808 -1 5 3 2 74.15 2.91 1.2788 -6 3 5 2 74.25 1.63 1.2773 -7 2 4 2 74.37 1.27 1.2755 -4 2 6 2 74.40 1.48 1.2750 -4 4 5 2 74.43 1.36 1.2746 -4 7 2 2 74.86 1.02 1.2685 2 -6 6 2 74.88 6.05 1.2682 4 -7 5 2 74.91 1.78 1.2676 -2 -5 5 2 74.94 6.91 1.2673 -4 -3 5 2 75.30 1.84 1.2621 -1 3 5 2 75.49 1.33 1.2594 -4 -2 6 2 76.56 2.17 1.2445 3 -6 6 2 76.66 1.56 1.2430 1 0 6 2 76.85 1.61 1.2404 2 2 4 2 76.87 2.12 1.2401 2 3 3 2 78.21 1.23 1.2223 0 -6 6 2 79.44 7.84 1.2064 4 -5 6 2 79.55 9.16 1.2050 -4 -4 3 2 80.91 1.31 1.1881 2 -7 6 2 80.95 6.42 1.1877 0 4 4 2 81.06 1.09 1.1863 -3 -5 2 2 81.92 1.58 1.1760 -6 2 6 2 82.73 1.68 1.1666 -2 -4 7 2 82.89 1.46 1.1647 2 -3 7 2 82.99 1.16 1.1636 4 -1 5 2 83.01 1.67 1.1633 -2 -6 2 2 83.67 2.38 1.1558 -6 5 5 2 83.71 1.41 1.1554 -6 0 6 2 85.12 1.64 1.1398 0 0 7 2 85.22 2.19 1.1387 0 7 0 2 86.67 1.38 1.1233 3 -4 7 2 86.89 2.05 1.1211 -4 4 6 2 88.69 1.38 1.1029 7 -4 4 2 88.91 1.10 1.1007 -7 2 6 2 89.32 1.22 1.0968 4 1 4 2 89.34 1.27 1.0966 4 2 3 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.