Tiettaite Panikorovskii T L, Pekov I V, Krzhizhanovskaya M G, Yakovenchuk V N, Britven S N, Gurzhiy V V, Bocharov V N, Yapaskurt V O, Krivovichev S V Crystallography Reports 66 (2021) 76-85 Tiettaite K4Na12Fe3+Si16O41(OH)4ยท2H2O: A mineral with a novel type of microporous heteropolyhedral framework Locality: Khibiny alkaline massif, Kola Peninsula, Russia _database_code_amcsd 0020968 28.866 10.707 17.425 90 90 90 Cmcm atom x y z occ Uiso K1 .5 .923 .664 .0037 K2 .5 .456 .646 .0037 Na1 .5 .266 .577 .0057 Na2 .3580 .924 .636 .0057 Na3 .339 0 .5 .0057 Na4 .357 .464 .501 .5 .0057 Fe1 .4502 0 .5 .5 .0010 Si1 .445 .828 .25 .0027 Si2 .3959 .771 .408 .0027 Si3 .449 .700 .545 .0027 Si4 .390 .601 .698 .5 .0027 Si5 .291 .710 .341 .5 .0027 Si6 .283 .412 .338 .5 .0027 O1 .399 .918 .437 .0027 O2 .450 .849 .566 .0027 O3 .5 .648 .536 .0027 O4 .422 .622 .616 .0027 O5 .422 .681 .466 .0027 O6 .340 .722 .396 .0027 O7 .419 .768 .329 .0027 O8 .5 .792 .25 .0027 O9 .439 .984 .25 .0027 OH10 .5 .070 .565 .0027 OH11 .5 .699 .684 .0027 OH12 .290 .984 .75 .0027 O13 .390 .731 .75 .0027 O14 .413 .49 .75 .5 .0027 O15 .337 .567 .674 .5 .0027 O16 .332 .39 .382 .25 .0027 O17 .290 .386 .25 .5 .0027 O18 .266 .567 .352 .5 .0027 OH19 .303 .733 .25 .75 .0027 OH20 .255 .818 .371 .5 .0027 Wat21 .27769 .89356 .40283 .375 .0027 Oh21 .27769 .89356 .40283 .125 .0027 Wat22 .25469 .09356 .50883 .2 .0027