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: hgi, T = 850 C Locality: from rhyodacite, Parana, Brazil _database_code_amcsd 0008640 9.840 9.021 5.3184 90 109.35 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 .2499 .6526 .2463 .7108 .022 .023 .024 .019 .000 .005 -.003 FeM1 .2499 .6526 .2463 .2625 .022 .023 .024 .019 .000 .005 -.003 MnM1 .2499 .6526 .2463 .0085 .022 .023 .024 .019 .000 .005 -.003 CaM1 .2499 .6526 .2463 .0182 .022 .023 .024 .019 .000 .005 -.003 MgM2 .2514 .0187 .2458 .2137 .035 .036 .041 .024 .007 .003 -.002 FeM2 .2514 .0187 .2458 .5722 .035 .036 .041 .024 .007 .003 -.002 MnM2 .2514 .0187 .2458 .0189 .035 .036 .041 .024 .007 .003 -.002 CaM2 .2514 .0187 .2458 .1952 .035 .036 .041 .024 .007 .003 -.002 SiA .0445 .3390 .2659 .018 .017 .019 .019 -.003 .007 -.004 SiB .5451 .8392 .2565 .017 .014 .019 .018 -.002 .005 .001 O1A .8697 .3378 .1564 .023 .016 .029 .023 .001 .005 -.005 O1B .3719 .8400 .1482 .024 .017 .029 .024 .001 .005 .004 O2A .1237 .4959 .3460 .029 .035 .016 .036 -.010 .012 -.005 O2B .6241 .9921 .3559 .036 .038 .036 .039 -.015 .020 -.011 O3A .1019 .2429 .5446 .039 .020 .061 .035 .005 .006 .028 O3B .6029 .7352 .5284 .041 .027 .058 .040 .002 .012 .024