Kostylevite Ilyukhin V V, Khomyakov A P, Shumyatskaya N G, Voronkov A A, Nevskii N N, Belov N V Soviet Physics Doklady 26 (1981) 118-120 The crystal structure of the new natural zirconosilicate K4Zr2Si6O18*2H2O Locality: Khibinsk massif, Kola Peninsula, Russia Note: dimorphic with umbite Note: y(O7) corrected _database_code_amcsd 0015609 6.565 13.171 11.727 90 90 105.26 P2_1/b atom x y z Biso K1 .7950 .0853 .5484 1.78 K2 .6816 .8849 .8831 3.03 Zr .1223 .2205 .7834 .72 Si1 .8438 .1557 .0275 .68 Si2 .5885 .1513 .8132 .64 Si3 .7909 .0181 .2357 .61 O1 .8037 .2003 .7470 1.06 O2 .0573 .1920 .9536 1.24 O3 .4391 .2298 .8145 1.20 O4 .1649 .3775 .8129 1.12 O5 .1943 .2557 .6115 1.20 O6 .0770 .0636 .7326 1.21 O7 .6372 .1188 .9436 1.41 O8 .8495 .0525 .1024 1.38 O9 .4662 .0376 .7568 1.01 Wat .4029 .1243 .4927 2.83