Cumengeite Hawthorne F C, Groat L A Mineralogical Magazine 50 (1986) 157-162 The crystal structure and chemical composition of cumengeite Locality: Boleo, Baja California, Mexico CELL PARAMETERS: 15.0650 15.0650 24.4360 90.000 90.000 90.000 SPACE GROUP: I4/mmm X-RAY WAVELENGTH: 1.541838 MAX. ABS. INTENSITY / VOLUME**2: 30.28628612 2-THETA INTENSITY D-SPACING H K L 6.89 11.67 12.8238 1 0 1 7.24 68.37 12.2180 0 0 2 11.75 42.13 7.5325 2 0 0 12.35 60.62 7.1651 1 0 3 13.63 3.25 6.4949 2 1 1 13.81 4.41 6.4119 2 0 2 14.50 10.06 6.1090 0 0 4 16.64 1.70 5.3263 2 2 0 17.08 31.60 5.1915 2 1 3 18.03 31.86 4.9189 3 0 1 18.17 100.00 4.8825 2 2 2 18.63 1.77 4.7640 3 1 0 18.70 40.15 4.7447 2 0 4 20.00 8.09 4.4385 3 1 2 20.78 21.25 4.2746 3 0 3 21.58 10.81 4.1185 3 2 1 21.82 6.34 4.0727 0 0 6 22.14 77.27 4.0146 2 2 4 22.47 1.71 3.9560 2 1 5 23.38 15.31 3.8041 1 1 6 23.62 60.78 3.7662 4 0 0 23.68 22.79 3.7567 3 1 4 23.94 62.57 3.7177 3 2 3 24.64 5.36 3.6136 4 1 1 24.74 3.90 3.5991 4 0 2 25.08 28.62 3.5509 3 3 0 25.43 2.44 3.5023 3 0 5 26.13 14.23 3.4098 3 3 2 26.20 12.72 3.4008 1 0 7 26.46 6.59 3.3686 4 2 0 26.74 3.60 3.3338 4 1 3 27.57 71.43 3.2353 2 2 6 27.83 2.53 3.2059 4 0 4 28.10 2.62 3.1758 3 2 5 28.80 54.17 3.0995 2 1 7 28.84 10.69 3.0956 3 1 6 29.09 4.38 3.0699 3 3 4 29.24 18.94 3.0545 0 0 8 29.88 9.56 2.9904 4 3 1 29.88 31.14 2.9904 5 0 1 30.30 6.24 2.9499 4 2 4 30.44 3.47 2.9362 1 1 8 30.55 2.31 2.9264 4 1 5 31.20 1.94 2.8663 3 0 7 31.61 14.97 2.8306 2 0 8 31.66 21.73 2.8259 5 0 3 32.21 20.51 2.7793 5 2 1 32.38 9.89 2.7651 4 0 6 33.45 5.26 2.6789 3 2 7 33.48 2.89 2.6764 3 3 6 33.54 9.12 2.6721 1 0 9 33.65 24.35 2.6631 4 4 0 33.70 24.53 2.6598 5 1 4 34.47 23.59 2.6020 4 4 2 34.55 7.85 2.5958 4 2 6 34.72 10.81 2.5836 5 3 0 34.89 11.25 2.5714 3 1 8 34.99 2.00 2.5648 4 3 5 34.99 7.42 2.5648 5 0 5 35.51 2.78 2.5277 5 3 2 35.57 1.43 2.5240 4 1 7 35.76 7.59 2.5108 6 0 0 36.46 2.22 2.4640 6 1 1 36.53 2.36 2.4594 6 0 2 36.82 18.48 2.4413 4 4 4 37.03 31.16 2.4279 5 2 5 37.61 52.53 2.3915 5 1 6 37.66 8.64 2.3884 3 0 9 37.81 37.20 2.3796 5 3 4 37.93 13.41 2.3724 4 0 8 37.97 13.52 2.3696 6 1 3 38.44 3.55 2.3419 5 4 1 38.51 26.77 2.3380 6 2 2 38.74 5.19 2.3244 2 0 10 38.89 16.78 2.3156 3 3 8 39.51 5.59 2.2809 5 0 7 39.84 8.62 2.2628 4 2 8 39.88 6.00 2.2604 5 4 3 40.62 2.85 2.2210 2 2 10 40.65 3.96 2.2193 6 2 4 41.36 31.84 2.1830 5 2 7 41.43 9.32 2.1793 4 1 9 42.15 3.98 2.1438 7 0 1 42.29 1.54 2.1373 6 0 6 42.43 1.88 2.1305 5 5 0 42.43 1.22 2.1305 7 1 0 42.65 1.14 2.1199 5 4 5 43.10 3.00 2.0988 7 1 2 43.10 2.43 2.0988 5 5 2 43.31 4.40 2.0891 6 4 0 43.49 1.34 2.0807 7 0 3 44.04 5.25 2.0561 6 2 6 44.39 1.32 2.0406 6 3 5 44.49 1.94 2.0363 0 0 12 44.60 21.91 2.0315 3 0 11 44.87 2.17 2.0199 6 1 7 44.94 12.76 2.0170 4 3 9 45.04 3.18 2.0130 3 3 10 45.07 8.47 2.0117 7 1 4 45.07 18.84 2.0117 5 5 4 45.17 2.69 2.0073 4 4 8 45.21 8.74 2.0056 7 2 3 45.87 11.41 1.9781 7 3 0 45.88 7.08 1.9780 4 2 10 45.91 1.42 1.9767 6 4 4 46.01 7.46 1.9726 5 3 8 46.18 3.47 1.9658 2 0 12 46.29 6.88 1.9615 3 2 11 46.51 12.00 1.9527 7 3 2 46.84 1.40 1.9396 6 0 8 48.18 1.02 1.8887 6 3 7 48.20 10.26 1.8878 5 5 6 48.33 4.93 1.8831 8 0 0 48.46 6.53 1.8784 6 2 8 48.50 7.19 1.8770 6 5 3 48.63 1.15 1.8724 3 1 12 48.83 3.69 1.8652 1 0 13 48.88 1.89 1.8631 8 1 1 49.92 4.09 1.8269 8 2 0 50.40 1.33 1.8105 2 1 13 50.73 9.75 1.7996 8 0 4 50.89 2.79 1.7942 6 5 5 51.08 9.69 1.7880 4 3 11 51.33 3.62 1.7801 7 2 7 51.35 1.74 1.7793 7 3 6 51.47 3.37 1.7754 6 6 0 51.47 1.56 1.7753 5 3 10 51.94 3.43 1.7604 3 0 13 52.00 1.60 1.7587 8 3 1 52.05 4.82 1.7570 6 6 2 52.23 1.27 1.7513 7 5 0 52.24 2.24 1.7512 6 0 10 52.26 11.89 1.7503 8 2 4 52.36 3.51 1.7474 5 5 8 52.42 1.22 1.7454 8 1 5 52.42 1.91 1.7454 7 4 5 52.51 4.63 1.7427 4 2 12 53.15 3.70 1.7233 8 3 3 53.62 1.55 1.7093 8 0 6 53.74 14.66 1.7057 6 2 10 53.77 4.67 1.7049 6 6 4 53.92 3.25 1.7004 2 0 14 54.40 5.83 1.6866 7 0 9 54.51 5.11 1.6835 7 5 4 54.75 2.06 1.6767 5 1 12 54.93 2.37 1.6715 4 1 13 55.10 1.33 1.6669 8 2 6 55.21 1.32 1.6637 9 1 0 55.33 3.87 1.6604 7 3 8 55.39 1.84 1.6586 2 2 14 55.77 1.07 1.6484 9 1 2 56.12 1.43 1.6389 3 1 14 56.69 3.30 1.6237 8 4 4 56.85 1.45 1.6196 1 0 15 56.92 2.00 1.6176 4 4 12 57.53 1.53 1.6021 9 2 3 57.64 1.86 1.5993 5 3 12 57.82 3.83 1.5948 4 3 13 58.27 7.36 1.5834 2 1 15 58.66 2.50 1.5739 8 3 7 59.66 1.31 1.5498 4 2 14 59.74 2.38 1.5478 6 2 12 59.83 5.41 1.5457 7 0 11 60.07 4.88 1.5401 9 1 6 60.11 1.65 1.5393 8 1 9 60.11 4.66 1.5393 7 4 9 60.19 2.34 1.5375 7 3 10 60.87 2.54 1.5218 7 7 0 60.98 2.89 1.5193 7 5 8 61.21 2.07 1.5142 7 2 11 61.39 2.78 1.5101 7 7 2 61.56 5.97 1.5065 10 0 0 62.24 2.68 1.4916 8 0 10 62.79 6.81 1.4799 9 2 7 62.81 2.55 1.4795 9 3 6 62.91 2.07 1.4772 10 2 0 62.94 1.08 1.4767 7 7 4 63.06 1.22 1.4743 10 1 3 63.16 1.66 1.4721 5 5 12 63.35 1.02 1.4681 2 2 16 63.61 1.48 1.4627 10 0 4 63.75 1.31 1.4598 9 4 5 63.92 5.66 1.4565 6 5 11 64.09 2.01 1.4529 9 5 2 64.13 5.67 1.4522 8 5 7 64.42 1.15 1.4463 5 3 14 64.71 2.27 1.4405 10 3 1 64.92 2.28 1.4363 6 6 10 64.95 1.75 1.4359 10 2 4 65.25 5.19 1.4300 7 4 11 65.61 2.75 1.4230 9 5 4 65.99 3.10 1.4157 7 0 13 66.34 1.48 1.4090 9 3 8 66.41 8.19 1.4078 5 2 15 66.66 1.21 1.4030 3 3 16 66.89 4.15 1.3988 10 4 0 67.03 2.00 1.3962 8 7 3 67.32 1.08 1.3910 4 2 16 67.44 1.31 1.3887 10 2 6 67.78 6.77 1.3826 8 0 12 68.09 6.02 1.3771 9 5 6 68.33 1.72 1.3728 9 6 3 68.94 2.51 1.3621 7 7 8 69.00 1.38 1.3611 8 7 5 69.25 1.70 1.3567 5 1 16 69.58 1.22 1.3511 10 0 8 69.64 1.21 1.3502 5 5 14 70.75 3.27 1.3316 8 8 0 70.86 2.15 1.3299 10 2 8 70.89 3.65 1.3294 10 5 3 71.15 2.25 1.3252 7 4 13 71.17 1.13 1.3249 4 4 16 71.29 1.54 1.3229 10 4 6 71.49 1.13 1.3196 9 5 8 71.90 1.07 1.3131 8 7 7 72.38 1.10 1.3056 3 1 18 72.43 1.18 1.3048 6 0 16 72.92 1.62 1.2973 4 3 17 72.96 2.43 1.2966 8 5 11 73.28 1.03 1.2918 10 6 0 73.30 4.98 1.2914 11 3 4 74.06 1.42 1.2801 8 0 14 74.17 4.08 1.2785 5 2 17 74.41 1.35 1.2749 11 0 7 74.46 1.03 1.2742 10 3 9 75.15 1.70 1.2642 10 2 10 77.16 1.22 1.2363 7 5 14 77.38 1.04 1.2332 9 2 13 77.68 1.77 1.2292 3 2 19 78.17 1.15 1.2228 11 0 9 78.87 2.54 1.2137 12 2 4 79.15 2.18 1.2101 10 3 11 79.24 1.04 1.2089 7 3 16 79.59 1.16 1.2045 12 3 3 79.81 2.02 1.2018 5 3 18 83.04 1.76 1.1630 11 4 9 83.80 1.05 1.1543 11 5 8 83.86 3.06 1.1537 9 2 15 84.00 2.00 1.1521 10 5 11 84.16 1.05 1.1503 11 7 2 85.07 2.00 1.1404 8 5 15 85.42 1.14 1.1366 9 9 6 85.54 1.78 1.1353 11 7 4 85.64 1.82 1.1342 13 2 3 87.82 1.42 1.1116 13 1 6 87.91 1.20 1.1107 0 0 22 89.01 1.44 1.0998 12 5 7 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.