COL ICSD Collection Code 202258 DATE Recorded Dec 19, 1988; updated May 13, 1997 NAME Sodium potassium yttrium silicate hydrate * MINR Montregianite - from Mont St.Hilaire, Quebec, Canada FORM Na2.82 K2 Y2 (Si16 O38) (H2 O)8.26 = H16.52 K2 Na2.82 O46.26 Si16 Y2 TITL Symmetry and crystal structure of montregianite Na4 K2 Y2 Si16 O38 (H2 O)10 a double-sheet silicate with zeolitic properties REF American Mineralogist AMMIA 72 (1987) 365-374 AUT Ghose S, Sen Gupta˙P˙K, Campana˙C˙F CELL a=9.512 b=23.956 c=9.617 ŕ=90.0 á=93.8 ç=90.0 V=2186.5 Z=2 SGR P 1 21/n 1 (14) - monoclinic CLAS 2/m (Hermann-Mauguin) - C2h (Schoenflies) PRS mP171 ANX A4B4C6D32X93 PARM Atom__No OxStat Wyck ---X--- ---Y--- ---Z--- -SOF- K 1 1.000 4e 0.0685 0.2488 0.5702 0.62 K 2 1.000 4e 0.541 0.2478 0.047 0.38 Na 1 1.000 4e 0.3713 0.4991 0.6312 0.95 Na 2 1.000 2b 1/2 1/2 0. 0.47 Na 3 1.000 2d 0. 1/2 1/2 0.45 Y 1 3.000 4e -0.25645 0.49845 0.74445 Si 1 4.000 4e -0.2661 0.18159 0.7344 Si 2 4.000 4e -0.4972 0.38752 0.2288 Si 3 4.000 4e 0.2275 0.38831-0.4931 Si 4 4.000 4e -0.4548 0.3887 0.5524 Si 5 4.000 4e -0.2553 0.31464 0.7465 Si 6 4.000 4e 0.2269 0.11133-0.4953 Si 7 4.000 4e 0.4979 0.1116 0.2246 Si 8 4.000 4e -0.4521 0.10614 0.5519 O 1 -2.000 4e -0.2588 0.2481 0.7358 O 2 -2.000 4e -0.6183 0.3414 0.1882 O 3 -2.000 4e 0.2029 0.3384 -0.6097 O 4 -2.000 4e -0.3907 0.1646 0.623 O 5 -2.000 4e 0.1264 0.1277 -0.3711 O 6 -2.000 4e -0.3769 0.1272 0.1274 O 7 -2.000 4e -0.4349 0.3718 0.3891 O 8 -2.000 4e 0.3827 0.3798 -0.4176 O 9 -2.000 4e 0.4517 0.4501 0.2176 O 10 -2.000 4e 0.211 0.4491 0.4465 O 11 -2.000 4e -0.4038 0.4494 0.5892 O 12 -2.000 4e -0.3758 0.339 0.6428 O 13 -2.000 4e -0.2757 0.332 0.9063 O 14 -2.000 4e 0.8934 0.3343 -0.2989 O 15 -2.000 4e -0.4379 0.1155 0.3852 O 16 -2.000 4e 0.3843 0.1067 -0.4185 O 17 -2.000 4e 0.6829 0.4428 -0.0799 O 18 -2.000 4e -0.0778 0.445 0.6889 O 19 -2.000 4e -0.3704 0.054 0.6113 OH2 20 -2.000 4e 0.8428 0.448 0.3443 OH2 21 -2.000 4e 0.3238 0.4521 0.857 OH2 22 -2.000 4e 0.622 0.2492 0.359 0.95 OH2 23 -2.000 4e 0.891 0.187 0.356 0.46 OH2 24 -2.000 4e 0.383 0.182 0.865 0.35 OH2 25 -2.000 4e 0.633 0.75 -0.61 0.37 H 1 1.000 4e 33 Atoms not located in Unit Cell WYCK e37 d b ˙ TF Atom U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) K 1 0.0558 0.0257 0.0458 0.0074 0.0148 0.0045 K 2 0.0387 0.0316 0.0380 -0.0104 0.0122 -0.0062 Na 1 0.0167 0.0219 0.0158 -0.0019 0.0036 -0.0046 Na 2 0.0111 0.0257 0.0186 0.0038 0.0083 0.0032 Na 3 0.0109 0.0224 0.0193 0.0040 0.0066 0.0007 Y 1 0.0022 0.0053 0.0057 -0.0001 0.0017 -0.0002 Si 1 0.0051 0.0083 0.0083 0.0006 0.0019 0.0000 Si 2 0.0035 0.0108 0.0082 -0.0005 0.0035 0.0000 Si 3 0.0037 0.0118 0.0084 -0.0003 0.0045 -0.0007 Si 4 0.0030 0.0120 0.0082 0.0006 0.0008 -0.0009 Si 5 0.0044 0.0092 0.0067 -0.0001 0.0009 -0.0008 Si 6 0.0044 0.0125 0.0077 -0.0009 0.0032 -0.0003 Si 7 0.0047 0.0125 0.0078 -0.0007 0.0034 0.0005 Si 8 0.0046 0.0133 0.0070 -0.0001 0.0009 0.0003 O 1 0.0165 0.0084 0.0207 -0.0036 0.0000 -0.0015 O 2 0.0075 0.0204 0.0186 -0.0060 0.0061 -0.0050 O 3 0.0262 0.0219 0.0144 -0.0063 0.0093 -0.0071 O 4 0.0108 0.0200 0.0247 0.0001 -0.0075 -0.0063 O 5 0.0072 0.0185 0.0112 -0.0009 0.0084 -0.0030 O 6 0.0098 0.0162 0.0118 -0.0036 0.0054 -0.0008 O 7 0.0215 0.0222 0.0068 0.0062 0.0021 -0.0021 O 8 0.0039 0.0362 0.0219 -0.0019 0.0015 0.0083 O 9 0.0097 0.0161 0.0203 0.0034 0.0029 0.0016 O 10 0.0175 0.0166 0.0190 0.0038 0.0067 0.0054 O 11 0.0151 0.0150 0.0161 -0.0014 0.0015 -0.0038 O 12 0.0224 0.0179 0.0189 0.0053 -0.0089 0.0017 O 13 0.0296 0.0182 0.0108 -0.0009 0.0107 -0.0037 O 14 0.0090 0.0274 0.0376 -0.0095 0.0130 -0.0050 O 15 0.0202 0.0511 0.0092 -0.0109 0.0008 -0.0004 O 16 0.0038 0.0320 0.0177 -0.0004 0.0041 0.0001 O 17 0.0125 0.0225 0.0119 0.0039 0.0080 0.0091 O 18 0.0165 0.0197 0.0235 0.0127 0.0134 0.0061 O 19 0.0223 0.0149 0.0421 0.0053 -0.0083 0.0060 O 20 0.0260 0.0914 0.0583 0.0061 0.0008 -0.0468 O 21 0.0532 0.0704 0.0293 -0.0342 0.0064 -0.0026 O 22 0.0715 0.0374 0.0671 0.0034 -0.0020 -0.0029 O 23 0.0337 0.2360 0.0435 0.0493 -0.0199 -0.0610 O 24 0.0270 0.1717 0.0400 0.0160 -0.0030 -0.0390 O 25 0.1140 0.0270 0.1160 -0.0003 -0.0549 -0.0050 REM H Y position may also contain .40 Ce RVAL 0.059 TEST Deviation of the charge sum from zero tolerable. (Code 22)