Forsterite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R050117 Smyth J R, Hazen R M American Mineralogist 58 (1973) 588-593 The crystal structures of forsterite and hortonolite at several temperatures up to 900 C T = 25 C CELL PARAMETERS: 4.7615 10.2215 5.9922 90.000 90.000 90.000 SPACE GROUP: Pbnm ATOM X Y Z OCCUPANCY ISO(B) Mg 0.00000 0.00000 0.00000 1.000 0.260 Mg 0.99150 0.27740 0.25000 1.000 0.220 Si 0.42620 0.09400 0.25000 1.000 0.080 O 0.76570 0.09130 0.25000 1.000 0.270 O 0.22150 0.44740 0.25000 1.000 0.240 O 0.27770 0.16280 0.03310 1.000 0.270 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: 7.460706308 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 17.35 22.93 5.1108 0 2 0 20.58 2.80 4.3162 1 1 0 22.87 65.75 3.8885 0 2 1 23.87 22.48 3.7279 1 0 1 25.43 14.35 3.5022 1 1 1 25.57 15.00 3.4838 1 2 0 29.66 6.25 3.0118 1 2 1 29.82 17.96 2.9961 0 0 2 32.31 63.35 2.7708 1 3 0 35.70 80.35 2.5150 1 3 1 36.51 100.00 2.4612 1 1 2 38.29 13.05 2.3506 0 4 1 38.84 10.19 2.3187 2 1 0 39.68 44.55 2.2716 1 2 2 40.04 30.54 2.2516 1 4 0 41.77 20.31 2.1624 2 1 1 44.54 4.68 2.0343 1 3 2 46.54 3.58 1.9515 2 3 0 46.72 2.55 1.9443 0 4 2 48.46 6.74 1.8785 1 5 0 48.86 1.66 1.8639 2 0 2 50.34 3.55 1.8127 1 1 3 50.95 3.71 1.7925 1 5 1 52.24 68.25 1.7511 2 2 2 52.54 20.02 1.7419 2 4 0 52.83 4.71 1.7328 1 2 3 54.89 14.37 1.6727 2 4 1 56.13 14.02 1.6386 0 6 1 56.26 3.52 1.6352 2 3 2 56.82 19.94 1.6203 1 3 3 57.45 1.31 1.6040 1 6 0 57.94 3.51 1.5915 1 5 2 58.67 10.08 1.5737 0 4 3 58.88 3.42 1.5684 3 1 0 60.33 1.85 1.5343 3 0 1 61.07 3.27 1.5173 3 1 1 61.14 2.73 1.5158 3 2 0 61.25 4.17 1.5133 2 1 3 61.59 5.37 1.5059 2 4 2 61.79 5.76 1.5015 2 5 1 61.94 30.27 1.4980 0 0 4 62.74 42.92 1.4809 0 6 2 63.29 1.25 1.4695 3 2 1 63.46 1.91 1.4659 2 2 3 64.80 3.05 1.4387 3 3 0 64.86 1.36 1.4376 0 2 4 66.88 7.86 1.3990 3 3 1 67.04 11.31 1.3960 1 7 0 67.40 8.08 1.3895 3 1 2 69.50 21.71 1.3525 3 2 2 69.75 8.04 1.3483 3 4 0 71.61 9.61 1.3178 1 3 4 71.76 4.89 1.3154 3 4 1 71.92 1.84 1.3128 2 4 3 72.99 4.90 1.2962 0 6 3 74.89 1.79 1.2679 2 0 4 75.07 1.11 1.2654 1 7 2 75.57 1.75 1.2583 2 1 4 75.62 1.29 1.2575 2 6 2 76.11 1.41 1.2507 1 6 3 76.36 2.52 1.2472 1 4 4 76.69 2.97 1.2426 3 0 3 77.66 1.73 1.2295 3 4 2 78.00 3.40 1.2250 2 5 3 80.73 5.27 1.1904 4 0 0 80.90 1.42 1.1883 2 3 4 82.33 2.98 1.1712 1 5 4 82.66 4.04 1.1674 3 3 3 82.71 2.68 1.1668 0 2 5 83.11 1.61 1.1622 1 0 5 83.61 4.78 1.1565 3 5 2 84.24 3.04 1.1495 2 7 2 85.01 2.44 1.1410 1 8 2 85.10 3.87 1.1401 3 6 1 85.49 5.65 1.1358 2 4 4 86.44 3.20 1.1258 2 8 0 87.24 4.65 1.1175 3 4 3 88.99 5.52 1.1000 1 3 5 89.00 2.89 1.0998 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.