Leonhardite Baur W H, Joswig W, Fursenko B A, Belitsky I A European Journal of Mineralogy 9 (1997) 1173-1182 Symmetry reduction of the aluminosilicate framework of LAU topology by ordering of exchangeable cations: the crystal structure of primary leonhardite with a primitive Bravais lattice _database_code_amcsd 0006703 14.556 13.206 7.513 90 110.75 90 P2/a atom x y z occ Uiso K1 1/4 .56843 0 .795 .0393 Na11 3/4 .0867 0 .342 .194 Na12 .6833 .1219 .8918 .139 .030 Ca1 .51639 .24748 .73635 .638 .0190 Si11 .48790 .36713 .14686 .962 .0071 Al11 .48790 .36713 .14686 .038 .0071 Si12 .48996 .13338 .15051 .968 .0072 Al12 .48996 .13338 .15051 .032 .0072 Si21 .32884 .13316 .32172 .971 .0082 Al21 .32884 .13316 .32172 .029 .0082 Si22 .32755 .36450 .31796 .969 .0081 Al22 .32755 .36450 .31796 .031 .0081 Al11 .38114 .05784 .73368 .954 .0082 Si11 .38114 .05784 .73368 .046 .0082 Al12 .38373 .44011 .72875 .952 .0085 Si12 .38373 .44011 .72875 .048 .0085 O1 .51440 .25064 .2169 .0156 O21 .46730 .37487 .9220 .0153 O22 .46477 .12368 .9246 .0153 O31 .39297 .12852 .5461 .0165 O32 .39619 .37078 .5403 .0157 O41 .39034 .40191 .1883 .0167 O42 .39638 .09655 .2020 .0174 O51 .41977 .56544 .7300 .0156 O52 .58505 .06826 .2692 .0162 O6 .29354 .24850 .2640 .0168 O71 .26227 .05763 .7319 .0165 O72 .26536 .43752 .7307 .0161 Wat1 .6150 .1213 .6730 .0525 Wat2 .6336 .3375 .6421 .0503 Wat3 .6628 .2514 .0273 .0290 Wat4 3/4 .1932 1/2 .97 .0482