Aristarainite Ghose S, Wan C American Mineralogist 62 (1977) 979-989 Aristarainite: Na2Mg[B6O8(OH)4]2.4H2O: a sheet structure with chains of hexaborate polyanions _database_code_amcsd 0000598 18.886 7.521 7.815 90 97.72 90 P2_1/a atom x y z occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Mg 0 0 0 .00070 .00554 .00410 .00045 .00017 .00009 Na .15952 .3596 .2899 .00157 .02380 .01059 -.00167 -.00001 -.00302 B1 .43470 .3460 .3264 .00066 .00528 .00350 .00006 -.00010 -.00027 B2 .38760 .1974 .0335 .00065 .00470 .00421 .00000 .00028 -.00027 B3 .30083 .4000 .1834 .00062 .00544 .00377 .00022 .00013 -.00041 B4 .47496 .0483 .2533 .00117 .00659 .00523 .00067 .00092 .00065 B5 .25658 .1548 .9888 .00078 .00429 .00448 -.00009 .00009 .00064 B6 .33928 .4416 .4961 .00102 .00684 .00515 .00039 .00037 -.00020 O1 .47237 .1790 .3709 .00114 .00685 .00475 .00091 -.00037 -.00005 Oh2 .48064 .4734 .2541 .00094 .00852 .00385 -.00110 -.00001 -.00028 O3 .37300 .3084 .1864 .00060 .00486 .00354 .00015 -.00001 -.00030 O4 .40957 .4121 .4814 .00083 .00773 .00376 .00002 .00014 -.00092 O5 .43580 .0515 .0943 .00105 .00556 .00475 .00069 .00014 -.00031 Oh6 .42279 .3154 .9188 .00075 .00528 .00423 -.00025 .00042 -.00060 O7 .32265 .1240 .9421 .00066 .00723 .00552 -.00053 .00031 -.00208 O8 .24590 .2806 .1069 .00061 .00639 .00680 -.00031 .00033 -.00177 O9 .19713 .0630 .9168 .00057 .00617 .00783 -.00021 .00009 -.00208 O10 .28768 .4373 .3579 .00080 .01054 .00453 .00080 .00019 -.00114 Oh11 .48078 .0953 .7071 .00340 .01275 .00404 .00480 .00038 .00107 O12 .31871 .4800 .6537 .00137 .02170 .00438 .00226 .00034 -.00154 OW13 .08086 .2036 .0388 .00087 .00671 .00790 .00008 .00041 .00061 OW14 .16514 .3779 .5931 .00392 .03457 .02377 .00174 .00380 .00026 H1 .489 .491 .667 .8 H2 .438 .238 .842 1.2 H3 .476 .118 .599 1.4 H4 .348 .444 .741 1.4 H5 .073 .309 .983 1.0 H6 .119 .161 -.007 2.4 H7 .166 .502 .562 3.2 H8a .184 .367 .715 .5 5.0 H8b .117 .289 .585 .5 3.6