Cummingtonite Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern for R070204 Fischer K F American Mineralogist 51 (1966) 814-818 A further refinement of the crystal structure of cummingtonite (Mg,Fe)7(Si4O11)2(OH)2 CELL PARAMETERS: 9.574964 18.31623 5.199047 90.00000 102.6503 90.00000 SPACE GROUP: C2/m X-RAY WAVELENGTH: 1.541838 2-THETA INTENSITY D-SPACING H K L 9.66 68.65 9.1581 0 2 0 10.63 80.48 8.3224 1 1 0 17.48 14.78 5.0728 0 0 1 17.34 8.14 5.1108 1 3 0 18.62 24.36 4.7643 -1 1 1 19.38 15.50 4.5791 0 4 0 20.00 4.42 4.4375 0 2 1 21.34 22.18 4.1612 2 2 0 22.22 6.81 3.9987 1 1 1 22.87 5.38 3.8865 -2 0 1 23.17 42.02 3.8376 -1 3 1 26.18 50.61 3.4024 1 3 1 26.20 6.19 3.3991 0 4 1 26.11 1.26 3.4104 1 5 0 27.26 62.84 3.2700 2 4 0 28.66 5.60 3.1133 2 0 1 29.07 81.15 3.0701 3 1 0 29.24 3.86 3.0527 0 6 0 30.30 50.83 2.9476 2 2 1 30.14 4.13 2.9631 -2 4 1 30.37 10.51 2.9413 -1 5 1 30.59 1.53 2.9207 -3 1 1 32.25 13.84 2.7741 3 3 0 32.77 100.00 2.7310 1 5 1 33.64 10.57 2.6624 -3 3 1 34.89 3.97 2.5701 -1 1 2 34.26 50.52 2.6156 0 6 1 35.37 4.30 2.5364 0 0 2 34.83 1.44 2.5746 2 4 1 35.10 5.73 2.5554 2 6 0 36.74 2.97 2.4444 0 2 2 36.39 68.51 2.4671 -2 0 2 37.74 2.57 2.3822 -2 2 2 37.44 1.73 2.4007 -2 6 1 37.90 4.72 2.3727 3 5 0 38.73 1.04 2.3237 -4 0 1 38.94 12.08 2.3117 -1 7 1 39.11 24.55 2.3016 -3 5 1 39.33 3.31 2.2895 0 8 0 39.80 1.20 2.2632 4 2 0 40.01 16.93 2.2523 -4 2 1 41.57 1.39 2.1708 1 3 2 40.94 15.60 2.2028 -3 1 2 40.89 11.40 2.2053 1 7 1 41.55 5.09 2.1719 -2 4 2 41.40 47.88 2.1797 2 6 1 43.36 2.85 2.0855 -3 3 2 44.18 23.66 2.0488 2 0 2 43.33 3.44 2.0868 0 8 1 43.47 2.09 2.0806 4 4 0 45.33 1.75 1.9994 2 2 2 44.02 4.61 2.0559 2 8 0 44.76 13.06 2.0235 3 5 1 46.25 1.70 1.9615 1 5 2 45.23 3.22 2.0033 3 7 0 46.18 1.84 1.9644 4 0 1 46.52 1.78 1.9509 0 6 2 45.59 3.36 1.9885 1 9 0 45.98 1.66 1.9727 -2 8 1 46.29 4.70 1.9600 -3 7 1 46.71 11.56 1.9432 -4 0 2 47.34 1.11 1.9188 -2 6 2 47.90 2.89 1.8979 -3 5 2 47.82 2.93 1.9009 -4 2 2 48.34 10.43 1.8814 -1 9 1 48.97 5.00 1.8589 5 1 0 49.38 2.15 1.8445 2 8 1 49.08 2.24 1.8550 4 6 0 49.25 1.67 1.8490 -4 6 1 50.01 2.01 1.8227 1 9 1 51.02 11.23 1.7888 -4 4 2 51.08 2.90 1.7867 5 3 0 53.85 1.22 1.7012 2 6 2 54.40 3.07 1.6854 -2 2 3 53.91 6.91 1.6995 0 8 2 55.20 3.97 1.6628 0 2 3 55.09 7.84 1.6660 -1 3 3 54.16 1.51 1.6923 -3 7 2 54.65 3.29 1.6782 -2 8 2 54.43 10.27 1.6845 -5 1 2 54.53 3.51 1.6817 -5 5 1 54.70 1.00 1.6767 -3 9 1 55.60 38.93 1.6519 4 6 1 56.06 1.02 1.6393 -4 6 2 56.06 13.31 1.6393 1 11 0 56.22 2.37 1.6350 4 8 0 58.95 25.24 1.5656 -1 5 3 59.33 5.97 1.5566 4 0 2 58.42 5.62 1.5787 2 10 1 60.26 1.76 1.5346 4 2 2 59.31 6.74 1.5571 6 0 0 60.44 3.05 1.5307 1 9 2 62.03 18.01 1.4950 -2 6 3 60.62 17.79 1.5264 0 12 0 62.77 7.16 1.4792 0 6 3 61.93 3.42 1.4974 5 5 1 63.03 6.75 1.4738 4 4 2 62.23 1.75 1.4909 4 8 1 62.66 2.94 1.4815 -4 8 2 62.77 7.35 1.4793 -6 0 2 64.48 6.19 1.4441 -1 7 3 63.29 4.98 1.4684 3 11 0 64.13 1.00 1.4511 -3 11 1 64.76 3.93 1.4385 -4 10 1 66.69 1.79 1.4015 -1 11 2 66.25 39.12 1.4098 -6 6 1 67.40 1.92 1.3885 6 2 1 68.29 1.13 1.3725 -2 8 3 68.19 5.95 1.3743 -4 6 3 68.76 13.11 1.3643 5 1 2 70.29 7.55 1.3383 2 6 3 69.40 5.60 1.3533 1 11 2 70.49 2.86 1.3350 5 3 2 71.48 1.61 1.3189 -1 9 3 70.68 1.94 1.3318 -3 11 2 72.82 1.55 1.2979 -2 0 4 71.27 2.49 1.3222 -5 5 3 73.21 3.12 1.2918 -1 1 4 70.72 3.00 1.3311 7 1 0 70.72 1.42 1.3312 -6 6 2 72.18 4.12 1.3078 0 12 2 74.81 10.51 1.2682 0 0 4 74.90 1.03 1.2669 -1 3 4 72.81 21.85 1.2980 -2 12 2 72.32 1.29 1.3056 -6 8 1 72.62 2.42 1.3009 -5 9 2 72.59 1.25 1.3014 -7 1 2 74.06 1.06 1.2792 -3 9 3 73.82 1.38 1.2827 -6 2 3 73.50 1.05 1.2875 6 8 0 74.27 1.12 1.2761 6 6 1 75.41 1.30 1.2595 1 9 3 76.18 3.99 1.2487 -2 4 4 73.98 3.48 1.2803 -7 5 1 74.16 2.72 1.2777 4 12 0 74.28 1.93 1.2759 -7 3 2 75.96 1.43 1.2518 -2 10 3 77.20 2.22 1.2348 4 2 3 76.64 1.07 1.2424 0 10 3 77.29 4.41 1.2335 -4 0 4 78.01 3.19 1.2240 2 12 2 78.79 1.71 1.2138 6 0 2 79.39 1.26 1.2061 2 14 1 79.85 1.81 1.2003 -4 12 2 83.11 3.49 1.1613 2 0 4 80.96 10.16 1.1867 -5 11 2 80.95 1.24 1.1867 -8 2 1 82.34 1.97 1.1702 1 15 1 82.55 1.88 1.1678 8 0 0 86.16 1.07 1.1279 6 6 2 89.74 3.25 1.0919 3 1 4 86.43 1.47 1.1250 5 13 0 87.95 1.19 1.1095 -6 0 4 87.30 2.26 1.1161 7 9 0 88.31 1.36 1.1058 3 13 2 90.46 1.04 1.0851 5 5 3 89.95 5.11 1.0898 4 12 2 89.95 5.11 1.0898 4 12 2 XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.