Girvasite Krivovichev S V, Chernyatieva A P, Britvin S N, Yakovenchuk V N Russian Geology and Geophysics 56 (2015) 155-163 The crystal structure of girvasite, NaCa2Mg3(PO4)3(CO3)(H2O)6, a complex phosphate-carbonate hydrate based upon electroneutral heteropolyhedral layers Note: T = 173 K Locality: Zhelezny mine, Kovdor massif, Kola Peninsula, Russia _database_code_amcsd 0020967 CELL PARAMETERS: 6.4784 12.2313 21.3494 90.000 89.624 90.000 SPACE GROUP: P2_1/c X-RAY WAVELENGTH: 1.541838 Cell Volume: 1691.674 Density (g/cm3): 2.470 MAX. ABS. INTENSITY / VOLUME**2: 13.69272722 RIR: 1.805 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 8.28 100.00 10.6745 0 0 2 2 8.33 2.62 10.6129 0 1 1 4 11.00 3.66 8.0424 0 1 2 4 13.67 5.48 6.4783 1 0 0 2 14.48 7.57 6.1157 0 2 0 2 15.48 4.73 5.7249 1 1 0 4 16.05 2.12 5.5221 -1 0 2 2 16.05 1.27 5.5215 -1 1 1 4 16.71 2.01 5.3065 0 2 2 4 19.96 2.00 4.4480 -1 1 3 4 21.50 2.70 4.1326 1 0 4 2 21.61 2.48 4.1117 1 2 2 4 21.68 6.85 4.0985 -1 2 2 4 23.36 4.53 3.8087 0 3 2 4 25.03 14.88 3.5582 0 0 6 2 25.82 3.33 3.4506 1 3 0 4 26.08 2.96 3.4165 0 1 6 4 26.11 5.89 3.4132 -1 1 5 4 26.14 1.94 3.4090 -1 2 4 4 26.15 1.24 3.4083 1 3 1 4 27.19 2.87 3.2800 -1 3 2 4 27.54 2.37 3.2391 2 0 0 2 28.54 1.39 3.1274 1 0 6 2 28.75 5.62 3.1052 2 0 2 2 28.79 4.61 3.1009 2 1 1 4 28.86 11.25 3.0939 -2 0 2 2 29.03 6.01 3.0755 0 2 6 4 29.06 1.15 3.0731 -1 2 5 4 29.21 3.27 3.0578 0 4 0 2 29.48 1.08 3.0299 1 1 6 4 29.68 1.76 3.0098 2 1 2 4 30.31 4.02 2.9487 0 3 5 4 30.41 4.70 2.9396 0 4 2 4 30.81 4.22 2.9024 1 3 4 4 30.91 4.43 2.8931 -1 3 4 4 31.13 3.01 2.8728 2 1 3 4 31.25 2.45 2.8624 2 2 0 4 31.85 10.10 2.8094 0 4 3 4 32.38 6.20 2.7653 1 4 0 4 32.43 7.42 2.7611 -2 0 4 2 33.08 10.97 2.7082 2 1 4 4 33.37 3.59 2.6853 -1 1 7 4 33.42 1.58 2.6808 0 3 6 4 33.45 1.02 2.6792 -1 3 5 4 33.45 1.45 2.6787 1 4 2 4 33.50 1.82 2.6751 -1 4 2 4 33.82 2.01 2.6503 -2 2 3 4 34.40 3.01 2.6073 0 1 8 4 34.84 2.33 2.5751 -1 4 3 4 35.50 3.03 2.5287 2 2 4 4 36.13 3.56 2.4861 0 4 5 4 36.20 3.34 2.4814 1 3 6 4 36.32 1.74 2.4732 1 0 8 2 36.33 1.45 2.4728 -1 3 6 4 36.64 1.08 2.4525 -1 4 4 4 36.74 3.01 2.4459 0 2 8 4 36.80 3.55 2.4422 0 3 7 4 38.17 1.33 2.3581 2 1 6 4 39.62 2.53 2.2749 -1 5 1 4 41.29 2.49 2.1864 1 4 6 4 41.31 1.12 2.1854 2 3 5 4 41.48 1.73 2.1772 -1 5 3 4 42.70 1.68 2.1174 3 1 1 4 42.76 2.63 2.1147 -3 1 1 4 42.96 1.26 2.1051 1 5 4 4 43.01 2.38 2.1031 0 1 10 4 43.81 2.45 2.0663 2 0 8 2 44.05 1.55 2.0558 2 4 4 4 44.20 2.01 2.0493 -2 4 4 4 44.28 2.59 2.0457 -1 4 7 4 44.76 1.02 2.0247 -2 1 8 4 44.97 1.27 2.0158 0 5 6 4 45.09 2.28 2.0106 0 4 8 4 45.25 1.41 2.0041 1 1 10 4 46.11 1.40 1.9685 -2 4 5 4 46.67 3.24 1.9463 -2 2 8 4 47.17 1.63 1.9268 1 5 6 4 47.27 1.04 1.9229 1 4 8 4 47.66 2.14 1.9083 3 3 0 4 47.88 1.15 1.8997 -3 3 1 4 48.41 3.60 1.8804 3 3 2 4 48.51 1.17 1.8766 -3 3 2 4 49.55 1.15 1.8396 0 6 5 4 49.66 1.60 1.8357 2 5 4 4 49.76 1.05 1.8325 1 5 7 4 49.80 1.35 1.8310 -2 5 4 4 49.87 1.44 1.8285 -1 5 7 4 50.34 4.20 1.8127 -1 3 10 4 50.93 2.58 1.7929 -2 4 7 4 53.11 1.77 1.7244 0 7 2 4 53.39 1.41 1.7161 2 2 10 4 53.45 1.44 1.7143 2 5 6 4 54.36 1.44 1.6876 -1 4 10 4 58.53 1.19 1.5770 -3 4 6 4 59.60 1.14 1.5513 3 5 4 4 62.88 1.42 1.4780 3 2 10 4 67.45 1.02 1.3886 4 0 8 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.