Heulandite Wust T, Stolz J, Armbruster T American Mineralogist 84 (1999) 1126-1134 Partially dealuminated heulandite produced by acidic REECl3 solution: A chemical and single-crystal X-ray study Sample: REE100 Tetrahedral sites were refined as Si _database_code_amcsd 0002252 17.611 17.933 7.398 90 116.29 90 C2/m atom x y z occ Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Si1 .17760 .33000 .0926 .0135 .0277 .0160 .0006 .0080 -.0008 Si2 .28447 .41110 .4904 .0245 .0211 .0244 -.0011 .0134 -.0010 Si3 .29189 .19069 .2854 .0196 .0229 .0147 -.0011 .0095 .0003 Si4 .43213 .29855 .5794 .0158 .0294 .0167 .0005 .0075 .0003 Si5 0 .27754 0 .0144 .0349 .0166 0 .0060 0 Al1 0 .4225 0 .119 1.6 Al2 .489 0 .550 .109 2.2 Al3 .203 .5 .200 .074 2.2 Nab .466 .5 .767 .38 10.1 O1 .2988 .5 .5280 .050 .022 .044 0 .022 0 O2 .2652 .1218 .3846 .057 .039 .048 .001 .040 .010 O3 .1863 .3447 -.1126 .060 .049 .031 .005 .034 .001 O4 .2267 .3971 .2460 .048 .041 .026 -.012 .010 -.009 O5 .5 .3227 .5 .053 .064 .063 0 .049 0 O6 .0789 .3336 .0451 .016 .041 .054 .001 .016 .009 O7 .3760 .2298 .4535 .046 .053 .043 -.017 .001 -.016 O8 .4839 .2752 .8118 .049 .058 .025 -.008 .008 .012 O9 .2153 .2498 .1891 .029 .033 .045 .010 .020 .011 O10 .3767 .3710 .5630 .031 .040 .069 .010 .021 .002 WatA1 .373 0 .369 .56 8.1 WatA2 .444 0 .62 .15 15.79 WatA3 .400 0 .242 .43 15.79 WatA4 .395 0 .067 .15 4.4 WatA5 .440 0 .812 .49 12.7 WatA6 .563 0 .025 .41 12.5 WatA8 .496 .091 .591 .35 10.42 WatA9 .476 .076 .716 .16 4.7 WatB1 .395 .411 .105 .31 13.0 WatBb .433 .430 .006 .46 15.79 WatB2 .511 .5 .561 .55 10.1 WatB3 .409 .5 .076 .12 2.3 WatC2 .215 0 -.008 .65 8.0 WatC3 .258 0 .085 .39 3.0