Chevkinite-(Nd) Calvo C, Faggiani R American Mineralogist 59 (1974) 1277-1285 A re-investigation of the crystal structures of chevkinite and perrierite Locality: natural, but location not given _database_code_amcsd 0000434 CELL PARAMETERS: 13.3250 5.7060 10.9980 90.000 100.820 90.000 SPACE GROUP: P2_1/a X-RAY WAVELENGTH: 1.541838 Cell Volume: 821.339 Density (g/cm3): 5.267 MAX. ABS. INTENSITY / VOLUME**2: 21.77615495 RIR: 1.346 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 8.18 12.52 10.8025 0 0 1 2 13.53 10.21 6.5441 2 0 0 2 16.41 52.68 5.4012 0 0 2 2 17.11 4.60 5.1826 2 0 1 2 18.28 29.85 4.8527 -1 1 1 4 19.24 2.07 4.6123 -2 0 2 2 19.40 66.56 4.5750 1 1 1 4 20.65 3.95 4.3007 2 1 0 4 21.27 1.38 4.1767 -2 1 1 4 22.76 16.40 3.9068 -1 1 2 4 23.19 2.85 3.8364 2 1 1 4 23.24 1.44 3.8278 2 0 2 2 24.72 25.46 3.6008 0 0 3 2 24.82 5.80 3.5870 -2 1 2 4 25.70 43.71 3.4658 3 1 0 4 25.80 69.20 3.4533 -3 1 1 4 28.07 1.94 3.1788 2 1 2 4 28.19 96.32 3.1656 3 1 1 4 28.45 72.42 3.1373 -3 1 2 4 29.03 46.00 3.0757 -1 1 3 4 29.13 44.68 3.0652 -4 0 2 2 29.98 45.75 2.9802 4 0 1 2 30.50 3.97 2.9309 2 0 3 2 31.19 39.46 2.8672 1 1 3 4 31.35 71.96 2.8530 0 2 0 2 31.52 2.16 2.8385 4 1 0 4 32.46 9.82 2.7584 0 2 1 4 32.72 72.06 2.7373 3 1 2 4 32.86 3.23 2.7256 -1 2 1 4 33.09 100.00 2.7069 -3 1 3 4 33.17 77.16 2.7006 0 0 4 2 33.37 19.57 2.6855 -4 0 3 2 33.52 5.24 2.6734 1 2 1 4 34.29 11.83 2.6153 2 2 0 4 34.40 1.34 2.6071 2 1 3 4 34.62 13.64 2.5913 4 0 2 2 34.68 6.75 2.5866 -2 2 1 4 35.59 35.29 2.5227 0 2 2 4 35.93 7.41 2.4993 2 2 1 4 36.27 3.48 2.4766 -1 1 4 4 37.05 2.90 2.4263 -2 2 2 4 37.06 1.57 2.4258 -2 1 4 4 37.29 4.39 2.4116 -5 1 1 4 37.67 1.03 2.3878 3 2 0 4 37.81 10.43 2.3792 5 1 0 4 38.14 1.01 2.3594 4 1 2 4 38.37 1.28 2.3459 2 0 4 2 38.65 6.93 2.3295 3 1 3 4 38.65 6.42 2.3295 1 1 4 4 39.06 8.59 2.3062 -4 0 4 2 39.11 3.27 2.3033 -3 1 4 4 39.39 1.52 2.2875 2 2 2 4 40.11 3.61 2.2482 -1 2 3 4 40.33 9.67 2.2362 0 2 3 4 40.59 16.89 2.2228 4 0 3 2 40.63 12.44 2.2206 -6 0 1 2 41.48 1.03 2.1768 -2 0 5 2 41.64 7.26 2.1689 -6 0 2 2 41.76 3.46 2.1628 1 2 3 4 41.81 41.86 2.1606 -4 2 1 4 42.02 22.10 2.1504 4 2 0 4 43.33 13.89 2.0884 -4 2 2 4 43.74 2.67 2.0694 -6 1 1 4 43.86 10.58 2.0643 6 0 1 2 43.93 11.68 2.0609 4 2 1 4 44.14 4.07 2.0519 -1 1 5 4 44.31 3.07 2.0444 2 2 3 4 44.33 8.08 2.0434 -6 0 3 2 45.56 15.44 1.9911 3 1 4 4 46.07 20.65 1.9701 -3 1 5 4 46.29 55.67 1.9613 0 2 4 4 46.44 4.32 1.9555 -4 2 3 4 46.49 16.58 1.9534 -2 2 4 4 46.68 13.57 1.9460 1 1 5 4 46.68 1.21 1.9459 -5 2 1 4 46.68 2.75 1.9457 2 0 5 2 47.12 2.48 1.9288 5 2 0 4 47.39 5.33 1.9182 4 2 2 4 47.83 2.25 1.9017 -5 2 2 4 48.89 2.18 1.8628 -1 3 1 4 49.37 7.39 1.8459 1 3 1 4 49.38 1.26 1.8455 5 1 3 4 49.93 5.97 1.8264 2 3 0 4 49.95 1.75 1.8258 -2 0 6 2 50.22 1.51 1.8166 -2 3 1 4 50.36 13.77 1.8120 2 2 4 4 50.71 2.49 1.8004 0 0 6 2 50.91 5.40 1.7935 -4 2 4 4 51.16 2.47 1.7856 2 3 1 4 51.18 16.44 1.7850 -7 1 2 4 51.43 18.99 1.7768 7 1 0 4 52.01 5.31 1.7584 -2 3 2 4 52.16 8.00 1.7534 4 2 3 4 52.20 6.98 1.7524 -6 2 1 4 52.48 4.24 1.7435 3 3 0 4 52.54 5.75 1.7419 -3 3 1 4 52.54 1.75 1.7417 5 2 2 4 52.54 2.15 1.7417 -1 2 5 4 52.83 6.83 1.7329 6 2 0 4 52.91 3.01 1.7306 -2 2 5 4 53.01 8.02 1.7275 6 0 3 2 53.04 14.42 1.7266 -6 2 2 4 53.18 6.00 1.7224 0 2 5 4 53.20 6.13 1.7218 3 1 5 4 53.27 15.22 1.7196 -4 0 6 2 53.76 4.69 1.7051 -3 1 6 4 53.82 1.86 1.7033 2 3 2 4 53.83 10.22 1.7032 -6 0 5 2 53.89 11.49 1.7013 3 3 1 4 54.04 7.80 1.6968 -3 3 2 4 54.39 5.04 1.6869 -1 3 3 4 54.90 15.09 1.6724 6 2 1 4 55.17 10.72 1.6649 4 0 5 2 55.18 11.35 1.6645 -8 0 1 2 55.19 4.26 1.6644 1 1 6 4 55.30 10.73 1.6613 -6 2 3 4 55.55 5.26 1.6543 -8 0 2 2 55.67 7.57 1.6510 5 1 4 4 55.71 5.43 1.6499 1 3 3 4 56.54 3.03 1.6278 -4 2 5 4 56.68 13.62 1.6240 3 3 2 4 56.71 15.46 1.6232 -7 1 4 4 56.93 14.62 1.6176 -3 3 3 4 56.98 1.12 1.6161 -4 3 2 4 57.32 2.19 1.6075 -8 0 3 2 57.42 12.19 1.6049 7 1 2 4 57.79 1.69 1.5955 2 3 3 4 58.03 2.26 1.5894 4 2 4 4 58.29 3.42 1.5828 6 2 2 4 58.64 1.57 1.5744 8 0 1 2 58.80 1.03 1.5704 -5 1 6 4 58.87 1.22 1.5687 -6 2 4 4 59.61 2.77 1.5511 -2 3 4 4 59.94 6.94 1.5432 0 0 7 2 60.14 1.71 1.5387 5 3 0 4 60.19 2.54 1.5374 -6 0 6 2 60.40 1.06 1.5326 -8 0 4 2 60.84 8.00 1.5226 0 2 6 4 61.34 3.07 1.5112 -1 1 7 4 61.36 1.94 1.5109 -7 1 5 4 61.48 9.52 1.5083 3 1 6 4 62.08 19.33 1.4951 -3 1 7 4 62.31 3.08 1.4901 8 0 2 2 62.91 1.07 1.4774 2 3 4 4 63.13 4.60 1.4728 -4 2 6 4 63.48 2.01 1.4655 4 0 6 2 64.19 1.33 1.4509 1 1 7 4 64.69 3.08 1.4409 -8 0 5 2 64.84 3.61 1.4380 4 2 5 4 64.85 1.34 1.4377 -8 2 1 4 65.06 4.31 1.4336 2 2 6 4 65.43 17.57 1.4265 0 4 0 2 65.91 4.16 1.4171 3 3 4 4 66.30 2.51 1.4097 -1 4 1 4 66.32 5.56 1.4095 -3 3 5 4 66.33 1.02 1.4092 9 1 0 4 66.37 1.54 1.4085 6 0 5 2 66.70 1.98 1.4024 1 4 1 4 66.73 1.29 1.4017 -9 1 3 4 66.79 2.52 1.4006 1 3 5 4 66.80 4.24 1.4005 -8 2 3 4 66.89 1.61 1.3988 6 3 1 4 67.09 4.79 1.3952 -7 1 6 4 67.14 2.41 1.3942 8 0 3 2 67.25 1.52 1.3922 -6 3 3 4 67.44 1.29 1.3887 -6 0 7 2 68.01 4.70 1.3784 8 2 1 4 68.15 7.29 1.3759 7 1 4 4 68.57 3.41 1.3686 6 2 4 4 68.73 1.12 1.3658 9 1 1 4 69.22 1.90 1.3574 0 2 7 4 69.38 4.13 1.3545 -9 1 4 4 69.45 9.25 1.3534 -6 2 6 4 69.63 7.20 1.3503 0 0 8 2 70.44 5.19 1.3368 -7 3 2 4 70.64 4.72 1.3334 7 3 0 4 70.88 1.69 1.3295 -10 0 1 2 70.93 1.52 1.3287 -1 4 3 4 71.08 1.13 1.3262 0 4 3 4 71.42 4.59 1.3208 8 2 2 4 71.65 1.11 1.3171 -2 3 6 4 71.99 2.23 1.3117 -10 0 3 2 72.07 1.49 1.3104 1 4 3 4 72.12 1.56 1.3096 3 3 5 4 72.18 1.31 1.3088 10 0 0 2 72.45 1.37 1.3045 4 0 7 2 72.60 1.36 1.3023 -3 3 6 4 73.18 3.82 1.2933 -4 4 2 4 73.62 3.52 1.2867 4 4 1 4 73.65 3.14 1.2862 -8 2 5 4 73.78 1.14 1.2843 1 1 8 4 74.15 1.10 1.2788 6 3 3 4 74.23 3.01 1.2777 5 3 4 4 74.67 2.25 1.2711 10 0 1 2 75.12 5.14 1.2647 -7 3 4 4 75.24 7.69 1.2630 6 2 5 4 75.35 9.38 1.2613 0 4 4 4 75.46 1.58 1.2598 -4 4 3 4 75.73 3.93 1.2560 7 3 2 4 75.97 1.45 1.2526 8 2 3 4 75.97 1.21 1.2526 -8 3 1 4 75.97 1.77 1.2526 5 4 0 4 76.18 1.96 1.2497 4 4 2 4 76.25 6.24 1.2486 -6 2 7 4 76.51 1.66 1.2451 -5 4 2 4 77.92 1.10 1.2261 -10 0 5 2 78.33 1.09 1.2206 10 0 2 2 78.34 4.79 1.2205 0 2 8 4 78.93 1.18 1.2129 -4 2 8 4 78.94 1.15 1.2128 8 3 1 4 79.31 3.61 1.2080 3 3 6 4 79.49 1.16 1.2058 -10 2 2 4 79.55 5.27 1.2050 -10 2 1 4 79.85 7.51 1.2012 -3 3 7 4 79.90 1.54 1.2005 4 4 3 4 79.93 2.76 1.2002 -6 4 1 4 80.02 5.01 1.1991 3 1 8 4 80.21 1.77 1.1968 5 4 2 4 80.21 1.98 1.1968 -1 4 5 4 80.61 1.30 1.1918 -10 2 3 4 80.72 6.29 1.1904 -3 1 9 4 81.06 5.46 1.1863 4 2 7 4 81.22 2.80 1.1843 -11 1 2 4 81.46 5.41 1.1814 -11 1 1 4 81.47 4.65 1.1814 -7 1 8 4 81.80 1.19 1.1774 -5 4 4 4 82.13 1.64 1.1736 6 4 1 4 82.16 2.00 1.1732 -11 1 3 4 82.46 1.42 1.1697 -6 4 3 4 82.86 2.78 1.1650 7 1 6 4 83.20 1.25 1.1611 10 2 1 4 84.08 1.61 1.1512 1 1 9 4 84.27 2.03 1.1491 -11 1 4 4 84.32 1.01 1.1485 -8 3 5 4 84.42 1.50 1.1475 -7 3 6 4 84.98 1.35 1.1413 -8 2 7 4 85.41 3.07 1.1367 7 3 4 4 85.47 1.65 1.1360 11 1 1 4 86.37 4.44 1.1264 -10 2 5 4 86.56 1.81 1.1245 -9 3 4 4 86.59 1.67 1.1242 2 5 0 4 86.78 4.52 1.1222 10 2 2 4 87.54 1.76 1.1144 -11 1 5 4 87.84 3.43 1.1114 8 0 6 2 88.20 2.31 1.1078 -2 5 2 4 88.34 2.35 1.1064 8 2 5 4 88.34 1.88 1.1064 0 2 9 4 88.40 2.60 1.1058 -10 0 7 2 88.99 1.78 1.1000 6 4 3 4 89.03 1.17 1.0996 10 0 4 2 89.07 1.30 1.0992 5 4 4 4 89.20 4.36 1.0979 -4 4 6 4 89.22 1.33 1.0978 11 1 2 4 89.32 1.61 1.0968 5 1 8 4 89.65 1.08 1.0936 2 5 2 4 89.65 3.11 1.0936 -6 4 5 4 89.70 1.43 1.0931 3 5 1 4 89.83 1.98 1.0919 -3 5 2 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.