Pigeonite Camara F, Carpenter M A, Domeneghetti M C, Tazzoli V Physics and Chemistry of Minerals 29 (2002) 331-340 Non-convergent ordering and displacive phase transition in pigeonite: in situ HT XRD study Sample: hga, T = 25 C Locality: from rhyodacite, Parana, Brazil _database_code_amcsd 0008637 9.719 8.947 5.251 90 108.49 90 P2_1/c atom x y z occ Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) MgM1 .2506 .6548 .2317 .7668 .006 .007 .006 .007 .000 .003 .000 FeM1 .2506 .6548 .2317 .2082 .006 .007 .006 .007 .000 .003 .000 MnM1 .2506 .6548 .2317 .0067 .006 .007 .006 .007 .000 .003 .000 CaM1 .2506 .6548 .2317 .0183 .006 .007 .006 .007 .000 .003 .000 MgM2 .2552 .0192 .2294 .1596 .011 .009 .016 .008 .001 .001 .003 FeM2 .2552 .0192 .2294 .6245 .011 .009 .016 .008 .001 .001 .003 MnM2 .2552 .0192 .2294 .0206 .011 .009 .016 .008 .001 .001 .003 CaM2 .2552 .0192 .2294 .1953 .011 .009 .016 .008 .001 .001 .003 SiA .0426 .3405 .2761 .007 .006 .006 .010 -.001 .004 -.001 SiB .5493 .8374 .2382 .006 .006 .005 .008 -.001 .003 -.001 O1A .8673 .3383 .1685 .009 .007 .009 .010 .000 .002 .000 O1B .3735 .8367 .1342 .009 .007 .009 .011 .000 .003 .001 O2A .1215 .4994 .3316 .011 .012 .007 .014 -.026 .006 -.001 O2B .6286 .9881 .3719 .014 .014 .011 .021 -.006 .011 -.008 O3A .1042 .2605 .5758 .017 .007 .022 .021 .002 .004 .013 O3B .6050 .7100 .4806 .013 .008 .017 .014 .000 .003 .006