Mountainite Zubkova N V, Pekov I V, Pushcharovsky D Y, Chukanov N V Zeitschrift fur Kristallographie 224 (2009) 389-396 The crystal structure and refined formula of mountainite, KNa2Ca2[Si8O19(OH)]*6H2O Locality: Yubileinaya pegmatite, Lovozero alkaline complex, Kola Peninsula, Russia _database_code_amcsd 0011131 13.704 6.5760 13.751 90 105.752 90 P2/c atom x y z occ Uiso K 0 .2758 .25 .0292 Na1 .4500 .8466 .5817 .5 .043 Na2 .4317 .7075 .4412 .5 .030 Ca .01912 .2444 .56031 .0129 Si1 .33509 .2235 .64951 .0117 Si2 .2193 .4690 .7635 .0109 Si3 .2042 .1638 .1284 .0118 Si4 .2096 .5042 .9833 .0120 O1 .7958 .2940 .2696 .022 O2 .1192 .3437 .7139 .018 O3 .3196 .3818 .7349 .018 O4 .9034 .0768 .4265 .0225 O5 .2724 .2975 .5383 .020 O6 .2543 .4703 .8860 .016 O7 .7495 .3064 .4441 .017 O8 .2930 .0055 .6734 .021 O9 .4534 .2051 .6583 .5 .022 OH9 .4534 .2051 .6583 .5 .022 O10 .0909 .4634 .4603 .018 Wat11 .9094 .0837 .6512 .023 Wat12 .5 .685 .75 .075 Wat13 .4747 .573 .4691 .5 .038 Wat14 .3600 .050 .3973 .5 .042 Wat15 .5488 .938 .5680 .5 .055