Heulandite-Na
	Gunter M E, Armbruster T, Kohler T, Knowles C R
	American Mineralogist 79 (1994) 675-682
	Crystal structure and optical properties of Na- and Pb-exchanged
	heulandite-group zeolites
	Sample: Na-exchanged
	Atomic parameters from ICSD
	_database_code_amcsd 0001669
	17.767 17.977 7.422 90 116.14 90 C2/m
	atom x y z occ Biso
	Na1 .1726 0 .689 .80 10.3
	Na2 .5392 0 .243 .84 7.3
	Na3 .2839 0 .029 .16 16.1
	Si1 .1788 .1698 .0958 .753 1.49
	Al1 .1788 .1698 .0958 .247 1.49
	Si2 .2864 .0892 .4949 .753 1.53
	Al2 .2864 .0892 .4949 .247 1.53
	Si3 .2905 .3098 .2826 .753 1.52
	Al3 .2905 .3098 .2826 .247 1.52
	Si4 .0673 .2978 .4171 .753 1.52
	Al4 .0673 .2978 .4171 .247 1.52
	Si5 0 .2165 0 .753 1.6
	Al5 0 .2165 0 .247 1.6
	O1 .3026 0 .537 2.4
	O2 .2341 .1197 .6182 3.23
	O3 .1879 .1556 .891 4.
	O4 .2311 .1033 .2498 2.79
	O5 0 .3218 .5 3.8
	O6 .0807 .1609 .0493 2.83
	O7 .3737 .2686 .4492 3.37
	O8 .0145 .2709 .1862 3.4
	O9 .2123 .2521 .1875 2.93
	O10 .1199 .3719 .4212 2.99
	OH11 .2839 0 .029 .68 16.1
	OH12 .5 0 .5 13.6
	OH13 .422 .0814 .035 13.1
	OH14 .074 0 .04 .56 26.9
	OH15 .082 0 .271 25.4
	OH16 .072 -.029 .758 .37 11.84
	O17 0 .1 .5 22.2
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