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: hgj, T = 950 C
Locality: from rhyodacite, Parana, Brazil
_database_code_amcsd 0008641
9.849 9.018 5.323 90 109.44 90 C2/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     0 .9020   .25 .6900 .024   .026   .025   .020      0   .006      0
FeM1     0 .9020   .25 .2820 .024   .026   .025   .020      0   .006      0
MnM1     0 .9020   .25 .0091 .024   .026   .025   .020      0   .006      0
CaM1     0 .9020   .25 .0189 .024   .026   .025   .020      0   .006      0
MgM2     0 .2688   .25 .2457 .037   .038   .043   .025      0   .003      0
FeM2     0 .2688   .25 .5401 .037   .038   .043   .025      0   .003      0
MnM2     0 .2688   .25 .0182 .037   .038   .043   .025      0   .003      0
CaM2     0 .2688   .25 .1960 .037   .038   .043   .025      0   .003      0
Si   .2948 .0892 .2617       .019   .017   .019   .019  -.002   .006  -.002
O1   .1207 .0889 .1522       .024   .018   .030   .024   .001   .005  -.001
O2   .3735 .2446 .3497       .034   .039   .026   .040  -.013   .017  -.009
O3   .3523 .0100 .0382       .042   .027   .061   .037  -.004   .010  -.027