Roumaite Biagioni C, Bonaccorsi E, Merlino S, Parodi G C, Perchiazzi N, Chevrier V, Bersani D The Canadian Mineralogist 48 (2010) 17-28 Roumaite, (Ca,Na)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: A new mineral species related to dovyrenite Locality: Rouma Island, Los Archipelago, Guinea _database_code_amcsd 0006312 CELL PARAMETERS: 7.4730 11.2940 18.7780 90.000 101.600 90.000 SPACE GROUP: Cc X-RAY WAVELENGTH: 1.541838 Cell Volume: 1552.494 Density (g/cm3): 3.543 MAX. ABS. INTENSITY / VOLUME**2: 9.521027470 RIR: 0.875 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 9.62 17.49 9.1972 0 0 2 1 14.41 1.17 6.1465 -1 1 1 2 14.42 6.09 6.1429 1 1 0 2 15.69 1.76 5.6470 0 2 0 2 15.94 4.49 5.5599 -1 1 2 2 15.96 8.96 5.5519 1 1 1 2 16.42 17.60 5.3983 0 2 1 2 18.44 3.07 4.8123 0 2 2 2 18.64 26.14 4.7597 -1 1 3 2 18.68 5.39 4.7514 1 1 2 2 19.30 2.27 4.5986 0 0 4 1 21.39 21.63 4.1538 0 2 3 2 22.11 8.66 4.0212 -1 1 4 2 22.14 18.09 4.0142 1 1 3 2 24.30 3.65 3.6632 -2 0 2 1 24.32 4.95 3.6602 2 0 0 1 24.97 41.13 3.5658 0 2 4 2 26.05 2.74 3.4208 -1 1 5 2 26.09 7.53 3.4152 1 1 4 2 26.62 2.61 3.3485 -1 3 1 2 26.63 4.90 3.3479 1 3 0 2 27.50 6.71 3.2433 -1 3 2 2 27.52 1.06 3.2417 1 3 1 2 28.65 10.13 3.1161 -2 2 1 2 28.97 15.79 3.0825 0 2 5 2 29.06 97.08 3.0732 -2 2 2 2 29.07 100.00 3.0714 2 2 0 2 29.13 68.68 3.0657 0 0 6 1 29.19 1.22 3.0591 -1 3 3 2 29.21 1.98 3.0569 1 3 2 2 30.27 50.31 2.9529 -2 2 3 2 30.30 51.46 2.9497 2 2 1 2 30.31 2.59 2.9491 -1 1 6 2 32.07 54.04 2.7908 0 4 1 2 33.19 16.52 2.6992 0 4 2 2 33.25 57.77 2.6943 0 2 6 2 34.17 9.77 2.6243 -2 0 6 1 34.24 9.06 2.6187 2 0 4 1 34.53 1.06 2.5979 -1 3 5 2 34.56 2.42 2.5954 1 3 4 2 34.75 17.29 2.5818 -2 2 5 2 34.79 1.37 2.5784 -1 1 7 2 34.81 16.10 2.5775 2 2 3 2 34.99 8.70 2.5646 0 4 3 2 37.37 17.00 2.4062 0 4 4 2 37.76 12.15 2.3825 0 2 7 2 37.80 1.34 2.3799 -2 2 6 2 37.87 1.15 2.3757 2 2 4 2 37.93 1.89 2.3723 -1 3 6 2 37.97 2.36 2.3700 1 3 5 2 39.18 14.67 2.2993 0 0 8 1 40.85 1.11 2.2093 -3 1 5 2 41.25 13.61 2.1886 -2 4 3 2 41.27 1.34 2.1873 -2 2 7 2 41.27 11.23 2.1873 2 4 1 2 41.35 1.71 2.1835 2 2 5 2 41.70 2.14 2.1661 -1 3 7 2 41.99 5.60 2.1516 -2 0 8 1 42.08 4.67 2.1473 2 0 6 1 42.45 3.90 2.1295 0 2 8 2 42.75 8.06 2.1154 -2 4 4 2 42.78 7.44 2.1136 2 4 2 2 43.32 1.29 2.0885 3 1 3 2 43.58 5.91 2.0769 0 4 6 2 44.78 25.82 2.0240 -2 4 5 2 44.83 26.13 2.0220 2 4 3 2 45.09 18.81 2.0106 -2 2 8 2 45.18 17.76 2.0071 2 2 6 2 46.19 1.59 1.9653 3 1 4 2 47.01 1.55 1.9331 -3 3 5 2 47.25 3.62 1.9236 0 4 7 2 47.29 2.72 1.9222 -2 4 6 2 47.30 1.94 1.9218 0 2 9 2 47.35 2.93 1.9200 2 4 4 2 48.62 1.10 1.8726 0 6 1 2 48.74 52.88 1.8682 -4 0 2 1 49.16 1.02 1.8533 -3 3 6 2 49.21 21.30 1.8517 -2 2 9 2 49.24 2.17 1.8506 3 3 3 2 49.29 20.50 1.8486 2 2 7 2 49.35 1.19 1.8466 -3 1 8 2 49.56 7.59 1.8394 0 0 10 1 49.83 1.47 1.8301 4 0 0 1 50.23 18.77 1.8164 -2 4 7 2 50.29 20.54 1.8142 2 4 5 2 50.73 3.25 1.7994 0 6 3 2 51.24 9.18 1.7829 0 4 8 2 51.85 1.74 1.7633 3 3 4 2 52.31 7.15 1.7490 0 2 10 2 52.52 1.92 1.7423 -4 2 4 2 52.57 1.69 1.7409 4 2 0 2 52.96 2.48 1.7289 -3 1 9 2 53.55 4.79 1.7114 -2 4 8 2 53.58 5.02 1.7104 -2 2 10 2 53.62 5.22 1.7092 2 4 6 2 53.67 5.25 1.7076 2 2 8 2 53.77 1.80 1.7048 -4 2 5 2 53.83 1.91 1.7029 4 2 1 2 54.59 41.48 1.6811 -2 6 1 2 54.77 1.16 1.6761 -3 3 8 2 54.78 21.62 1.6757 0 6 5 2 55.49 2.80 1.6560 -4 2 6 2 55.57 2.72 1.6537 4 2 2 2 56.37 1.16 1.6321 -3 5 4 2 56.74 1.56 1.6224 -1 5 8 2 57.02 1.25 1.6152 3 1 7 2 57.21 1.21 1.6102 -2 4 9 2 57.29 1.78 1.6081 2 4 7 2 57.48 2.88 1.6034 0 2 11 2 57.65 1.44 1.5990 -4 2 7 2 57.73 9.23 1.5969 -4 0 8 1 57.75 1.47 1.5964 4 2 3 2 57.85 7.35 1.5938 4 0 4 1 58.43 1.12 1.5794 -2 6 5 2 58.47 1.14 1.5784 2 6 3 2 59.54 6.07 1.5527 -4 4 3 2 59.56 5.64 1.5523 -4 4 1 2 60.03 1.96 1.5412 0 4 10 2 60.22 8.74 1.5366 -4 2 8 2 60.22 2.87 1.5366 -4 4 4 2 60.26 2.74 1.5357 4 4 0 2 60.34 8.81 1.5339 4 2 4 2 60.50 5.69 1.5302 0 6 7 2 60.55 1.10 1.5291 1 5 8 2 60.62 3.33 1.5276 -2 0 12 1 60.73 3.58 1.5251 2 0 10 1 61.19 1.23 1.5146 -2 4 10 2 61.28 1.03 1.5127 2 4 8 2 62.82 6.62 1.4793 0 2 12 2 62.95 2.00 1.4765 -4 4 6 2 63.03 2.37 1.4749 4 4 2 2 63.04 6.72 1.4746 -2 6 7 2 63.10 6.55 1.4734 2 6 5 2 63.19 2.50 1.4715 -4 2 9 2 63.32 2.62 1.4688 4 2 5 2 64.08 1.29 1.4531 -5 1 5 2 64.16 2.00 1.4515 -4 0 10 1 64.31 1.87 1.4484 4 0 6 1 65.47 5.13 1.4257 -2 4 11 2 65.49 1.46 1.4253 5 1 1 2 65.56 4.65 1.4239 2 4 9 2 66.20 2.33 1.4117 0 8 0 2 66.42 9.36 1.4076 0 8 1 2 67.07 5.41 1.3954 0 8 2 2 68.12 2.79 1.3764 -2 2 13 2 68.23 2.96 1.3745 2 2 11 2 68.34 2.02 1.3725 0 2 13 2 69.20 1.05 1.3577 -2 6 9 2 69.27 1.00 1.3564 2 6 7 2 69.67 2.84 1.3496 0 8 4 2 69.82 2.11 1.3471 0 4 12 2 71.21 1.16 1.3242 -2 0 14 1 71.30 1.28 1.3227 -4 6 3 2 71.32 1.06 1.3223 2 0 12 1 71.96 2.74 1.3122 -4 0 12 1 72.14 3.35 1.3093 4 0 8 1 72.97 1.18 1.2964 -4 6 5 2 73.03 1.08 1.2956 4 6 1 2 73.34 2.34 1.2909 -4 4 10 2 73.48 2.29 1.2888 4 4 6 2 74.09 1.39 1.2797 0 2 14 2 74.20 2.17 1.2781 -4 2 12 2 74.37 2.15 1.2755 4 2 8 2 74.88 8.33 1.2681 -2 4 13 2 74.99 8.11 1.2665 2 4 11 2 75.10 1.82 1.2650 0 4 13 2 76.15 7.93 1.2502 0 6 11 2 76.30 5.81 1.2480 -4 6 7 2 76.38 6.02 1.2468 4 6 3 2 76.62 2.83 1.2436 0 8 7 2 76.77 1.55 1.2415 -2 6 11 2 76.86 1.59 1.2403 2 6 9 2 78.86 2.52 1.2138 -6 2 4 2 78.89 2.65 1.2134 -6 2 2 2 78.90 1.54 1.2132 -2 8 7 2 78.96 1.47 1.2126 2 8 5 2 79.46 2.32 1.2061 -6 2 5 2 79.51 2.43 1.2054 -6 2 1 2 79.70 3.82 1.2031 0 8 8 2 80.04 1.52 1.1989 -2 4 14 2 80.15 1.55 1.1975 2 4 12 2 81.21 1.93 1.1845 -4 6 9 2 81.33 2.34 1.1831 4 6 5 2 81.56 1.02 1.1804 -2 8 8 2 83.16 1.52 1.1616 0 8 9 2 83.22 1.79 1.1609 -4 2 14 2 83.42 1.69 1.1586 4 2 10 2 84.22 5.94 1.1497 0 0 16 1 85.51 2.00 1.1356 -2 4 15 2 85.63 2.13 1.1343 2 4 13 2 85.93 2.49 1.1312 -6 4 5 2 85.94 2.51 1.1310 0 6 13 2 85.98 1.81 1.1306 -6 4 1 2 86.38 1.12 1.1263 -4 8 2 2 86.58 3.10 1.1243 -4 8 3 2 86.59 3.42 1.1241 -4 8 1 2 87.17 2.50 1.1182 -4 8 4 2 87.21 2.69 1.1178 4 8 0 2 88.32 1.86 1.1066 -6 4 7 2 88.42 1.98 1.1056 6 4 1 2 88.52 1.70 1.1046 -6 2 10 2 88.69 1.47 1.1029 6 2 4 2 89.32 1.27 1.0968 0 10 4 2 89.57 1.03 1.0943 -4 8 6 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.