Niocalite Mellini M Tschermaks Mineralogische und Petrographische Mitteilungen 30 (1982) 249-266 Niocalite revised: Twinning and crystal structure Note: cuspidine structure Locality: Oka, Quebec, Canada _database_code_amcsd 0015690 10.863 10.431 7.370 90 110.1 90 Pa atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Ca1 .9253 .6539 .4781 .018 .008 .008 -.005 .007 .000 Ca2 .9179 .6651 .9733 .007 .009 .005 .000 .003 .001 Ca3 .8123 .3743 .6825 .012 .009 .010 -.002 .004 .000 Ca4 .8200 .3679 .1700 .032 .015 .011 .003 .008 .000 Nb1 .6823 .1395 .8605 .003 .002 .001 .002 .001 .001 Ca5 .6628 .1325 .3504 .011 .014 .016 -.004 .004 -.001 Ca6 .5731 -.1617 .5523 .027 .013 .008 -.013 .006 -.004 Ca7 .5639 -.1542 .0428 .012 .005 .008 -.002 .003 -.002 Si1 .3651 .0654 .6663 .010 .008 .011 -.001 .004 -.003 Si2 .3776 .0541 .2414 .010 .008 .011 .001 .004 .000 Si3 .6169 .5578 .3524 .010 .014 .019 .000 .005 -.003 Si4 .6094 .5593 .7925 .010 .009 .009 .004 .000 .002 O1 .506 .009 .788 .008 .015 .024 .000 .000 .012 O2 .509 -.026 .269 .005 .027 .024 .004 .002 -.001 O3 .236 -.003 .686 .006 .024 .030 -.004 .009 .016 O4 .244 .005 .078 .008 .024 .015 .000 -.011 -.020 O5 .345 .219 .680 .028 .011 .025 .008 .004 .004 O6 .404 .201 .222 .084 .000 .024 -.006 .034 -.009 O7 .755 .502 .363 .020 .022 .030 .006 .013 .003 O8 .745 .505 .921 .011 .008 .045 -.002 .006 .001 O9 .493 .470 .240 .019 .020 .031 -.008 .007 -.013 O10 .482 .475 .775 .014 .016 .020 -.006 .002 .008 O11 .587 .704 .300 .055 .003 .011 .008 .002 .001 O12 .578 .710 .808 .012 .022 .014 .009 .001 -.005 O13 .626 .239 .042 .009 .033 .018 -.004 -.003 .007 O14 .623 .237 .622 .012 .007 .039 .000 .004 -.007 F .853 .246 .447 .013 .040 .055 .004 -.002 -.015 O16 .845 .225 .937 .000 .040 .021 -.008 -.008 .008 O17 .339 .032 .436 .049 .013 .025 -.007 .020 -.003 O18 .623 .533 .576 .055 .034 .014 .009 .022 -.001