Heulandite-Ca
	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: nonexchanged
	Atomic parameters from ICSD
	_database_code_amcsd 0001668
	17.671 17.875 7.412 90 116.39 90 C2/m
	atom x y z occ Biso
	Na1 .1549 0 .6666 .228 6.3
	Ca1 .1549 0 .6666 .44 6.3
	Ca2 .5402 0 .2031 .484 2.74
	K .2763 0 .01 .03 9.9
	Na2 .2763 0 .01 .097 9.9
	Si1 .1794 .1698 .0967 .753 1.34
	Al1 .1794 .1698 .0967 .247 1.34
	Si2 .2886 .0899 .5008 .753 1.42
	Al2 .2886 .0899 .5008 .247 1.42
	Si3 .2917 .3096 .2831 .753 1.35
	Al3 .2917 .3096 .2831 .247 1.35
	Si4 .0646 .2984 .411 .753 1.34
	Al4 .0646 .2984 .411 .247 1.34
	Si5 0 .2131 0 .753 1.4
	Al5 0 .2131 0 .247 1.4
	O1 .3048 0 .5466 2.8
	O2 .2313 .1194 .6132 3.05
	O3 .1833 .1543 .8842 3.22
	O4 .2385 .1065 .2555 2.45
	O5 0 .3259 .5 3.4
	O6 .082 .1587 .0626 2.22
	O7 .3729 .266 .4508 3.26
	O8 .0089 .2662 .1842 2.78
	O9 .2103 .2542 .1783 2.64
	O10 .1155 .3723 .3988 2.64
	OH11 .2763 0 .01 .83 9.9
	OH12 .5 0 .5 7.9
	OH13 .4228 .0817 .0307 5.4
	OH14 .094 0 .285 13.2
	OH15 .082 .005 .867 .43 11.84
	OH16 0 .0873 .5 20.5
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