Forsterite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R040052 Hazen R M American Mineralogist 61 (1976) 1280-1293 Effects of temperature and pressure on the crystal structure of forsterite T = 23 C, P = 1 atm olivine CELL PARAMETERS: 4.7558 10.1965 5.9817 90.000 90.000 90.000 SPACE GROUP: Pbnm ATOM X Y Z OCCUPANCY ISO(B) Si 0.42620 0.09400 0.25000 1.000 0.122 Mg 0.00000 0.00000 0.00000 1.000 0.261 Mg 0.99150 0.27740 0.25000 1.000 0.226 O 0.76570 0.09130 0.25000 1.000 0.262 O 0.22150 0.44740 0.25000 1.000 0.274 O 0.27770 0.16280 0.03310 1.000 0.272 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: 7.491716503 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 17.39 22.92 5.0982 0 2 0 20.61 2.79 4.3100 1 1 0 22.92 65.75 3.8801 0 2 1 23.90 22.48 3.7226 1 0 1 25.47 14.41 3.4969 1 1 1 25.62 15.01 3.4776 1 2 0 29.72 6.23 3.0065 1 2 1 29.87 17.93 2.9908 0 0 2 32.38 63.38 2.7652 1 3 0 35.77 80.25 2.5100 1 3 1 36.57 100.00 2.4572 1 1 2 38.38 13.04 2.3451 0 4 1 38.89 10.20 2.3158 2 1 0 39.75 44.57 2.2676 1 2 2 40.14 30.48 2.2467 1 4 0 41.83 20.28 2.1596 2 1 1 44.63 4.68 2.0304 1 3 2 46.62 3.57 1.9484 2 3 0 46.83 2.54 1.9401 0 4 2 48.58 6.71 1.8743 1 5 0 48.94 1.66 1.8613 2 0 2 50.43 3.56 1.8096 1 1 3 51.07 3.70 1.7885 1 5 1 52.33 68.26 1.7484 2 2 2 52.64 20.05 1.7388 2 4 0 52.93 4.68 1.7298 1 2 3 55.00 14.29 1.6697 2 4 1 56.28 13.93 1.6347 0 6 1 56.36 3.50 1.6325 2 3 2 56.94 19.85 1.6173 1 3 3 57.60 1.29 1.6003 1 6 0 58.08 3.54 1.5882 1 5 2 58.80 10.05 1.5705 0 4 3 58.96 3.42 1.5664 3 1 0 60.41 1.85 1.5324 3 0 1 61.16 3.28 1.5153 3 1 1 61.23 2.71 1.5138 3 2 0 61.36 4.13 1.5110 2 1 3 61.71 5.34 1.5032 2 4 2 61.92 5.71 1.4986 2 5 1 62.06 30.16 1.4954 0 0 4 62.90 42.69 1.4776 0 6 2 63.38 1.25 1.4675 3 2 1 63.57 1.88 1.4635 2 2 3 64.90 3.05 1.4367 3 3 0 64.99 1.34 1.4350 0 2 4 66.99 7.84 1.3970 3 3 1 67.22 11.24 1.3928 1 7 0 67.50 8.09 1.3876 3 1 2 69.61 21.61 1.3506 3 2 2 69.87 8.00 1.3462 3 4 0 71.76 9.59 1.3154 1 3 4 71.89 4.86 1.3133 3 4 1 72.07 1.82 1.3105 2 4 3 73.18 4.86 1.2934 0 6 3 75.03 1.79 1.2659 2 0 4 75.26 1.09 1.2626 1 7 2 75.71 1.74 1.2563 2 1 4 75.80 1.27 1.2550 2 6 2 76.30 1.39 1.2480 1 6 3 76.53 2.51 1.2449 1 4 4 76.82 2.95 1.2409 3 0 3 77.81 1.71 1.2276 3 4 2 78.17 3.36 1.2228 2 5 3 80.84 5.28 1.1889 4 0 0 81.06 1.41 1.1863 2 3 4 82.52 2.94 1.1689 1 5 4 82.81 4.02 1.1656 3 3 3 82.89 2.66 1.1647 0 2 5 83.28 1.59 1.1602 1 0 5 83.78 4.78 1.1546 3 5 2 84.45 3.00 1.1471 2 7 2 85.25 2.41 1.1384 1 8 2 85.28 3.83 1.1380 3 6 1 85.68 5.68 1.1338 2 4 4 86.67 3.19 1.1234 2 8 0 87.41 4.62 1.1157 3 4 3 89.15 2.87 1.0984 4 1 2 89.19 5.47 1.0980 1 3 5 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.