Forsterite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R040057 Brown G E, Prewitt C T American Mineralogist 58 (1973) 577-587 High-temperature crystal chemistry of hortonolite sample #12018 at T = 24 C Note: variety hortonolite CELL PARAMETERS: 4.7669 10.2453 6.0021 90.000 90.000 90.000 SPACE GROUP: Pbnm ATOM X Y Z OCCUPANCY ISO(B) Si 0.42700 0.09460 0.25000 1.000 0.310 Mg 0.00000 0.00000 0.00000 0.814 0.379 Fe 0.00000 0.00000 0.00000 0.186 0.379 Mg 0.98880 0.27780 0.25000 0.826 0.375 Fe 0.98880 0.27780 0.25000 0.164 0.375 Ca 0.98880 0.27780 0.25000 0.010 0.375 O 0.76610 0.09180 0.25000 1.000 0.466 O 0.21940 0.44820 0.25000 1.000 0.456 O 0.27950 0.16340 0.03360 1.000 0.527 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 4 +/- 9 +/- 5 MAX. ABS. INTENSITY / VOLUME**2: 9.595565470 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 17.31 18.66 5.1227 0 2 0 22.82 45.00 3.8965 0 2 1 23.84 15.57 3.7329 1 0 1 25.40 23.71 3.5073 1 1 1 25.53 11.65 3.4897 1 2 0 29.61 5.54 3.0168 1 2 1 29.77 13.32 3.0010 0 0 2 32.24 70.40 2.7762 1 3 0 34.64 4.85 2.5894 0 2 2 35.63 74.75 2.5197 1 3 1 36.45 100.00 2.4651 1 1 2 37.74 2.49 2.3835 2 0 0 38.20 12.51 2.3558 0 4 1 38.79 9.12 2.3215 2 1 0 39.61 32.78 2.2754 1 2 2 39.96 23.93 2.2563 1 4 0 41.72 15.36 2.1652 2 1 1 44.46 5.41 2.0379 1 3 2 46.46 2.18 1.9545 2 3 0 46.62 2.60 1.9482 0 4 2 48.35 5.65 1.8825 1 5 0 48.79 1.11 1.8664 2 0 2 50.25 4.98 1.8156 1 1 3 50.83 4.37 1.7962 1 5 1 52.16 68.39 1.7537 2 2 2 52.44 20.46 1.7449 2 4 0 52.74 3.87 1.7357 1 2 3 54.79 13.01 1.6755 2 4 1 55.99 13.01 1.6424 0 6 1 56.16 2.13 1.6378 2 3 2 56.71 18.01 1.6231 1 3 3 57.82 6.26 1.5947 1 5 2 58.54 8.70 1.5767 0 4 3 58.81 3.67 1.5702 3 1 0 60.25 1.09 1.5361 3 0 1 60.99 3.71 1.5191 3 1 1 61.06 2.20 1.5176 3 2 0 61.15 2.99 1.5155 2 1 3 61.47 4.65 1.5084 2 4 2 61.66 4.59 1.5042 2 5 1 61.83 26.62 1.5005 0 0 4 62.59 36.51 1.4841 0 6 2 63.20 1.24 1.4713 3 2 1 63.35 1.08 1.4681 2 2 3 64.70 3.74 1.4407 3 3 0 64.74 1.09 1.4400 0 2 4 66.78 7.54 1.4009 3 3 1 66.87 11.52 1.3991 1 7 0 67.30 8.52 1.3913 3 1 2 69.39 15.85 1.3543 3 2 2 69.51 1.33 1.3524 2 6 1 69.63 5.31 1.3502 3 4 0 71.47 10.27 1.3200 1 3 4 71.64 4.11 1.3173 3 4 1 71.78 1.85 1.3150 2 4 3 72.82 4.59 1.2988 0 6 3 74.76 2.62 1.2698 2 0 4 75.43 1.49 1.2602 2 1 4 75.46 2.16 1.2599 2 6 2 76.20 1.89 1.2494 1 4 4 76.57 1.88 1.2443 3 0 3 77.52 1.01 1.2314 3 4 2 77.84 2.66 1.2272 2 5 3 80.62 4.85 1.1917 4 0 0 82.14 2.38 1.1734 1 5 4 82.51 3.78 1.1691 3 3 3 82.54 1.74 1.1688 0 2 5 82.94 1.08 1.1641 1 0 5 83.45 5.41 1.1584 3 5 2 84.04 2.37 1.1517 2 7 2 84.78 1.80 1.1435 1 8 2 84.92 2.56 1.1420 3 6 1 85.32 5.94 1.1377 2 4 4 86.21 3.02 1.1281 2 8 0 87.07 3.63 1.1192 3 4 3 88.11 1.06 1.1087 2 8 1 88.80 4.71 1.1018 1 3 5 88.87 2.54 1.1012 4 1 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.