Melilite
Armbruster T, Rothlisberger F, Seifert F
American Mineralogist 75 (1990) 847-858
Layer topology, stacking variation and site distortion in melilite-related
compounds in the system CaO-ZnO-GeO2-SiO2
low-temperature polymorph
Ca2ZnGe1.25Si.75O7
_database_code_amcsd 0001316
9.112 7.900 9.380 90 114.03 90 P2_1/n
atom      x      y      z  occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Zn1  .82867 .09678 .11477      0.0081 0.0101 0.0100 0.0001 0.0044 0.0010
Ge2  .87207 .45559 .20899 .734 0.0061 0.0061 0.0061      0 .00250      0
Si2  .87207 .45559 .20899 .266 0.0061 0.0061 0.0061      0 .00250      0
Ge3  .96891 .76878 .07667 .521 0.0059 0.0059 0.0059      0 .00240      0
Si3  .96891 .76878 .07667 .479 0.0059 0.0059 0.0059      0 .00240      0
Ca4   .4574  .2821  .0282      0.0087 0.0107 0.0071 0.0024 0.0026 0.0006
Ca5   .2891  .5654  .2014      0.0120 0.0244 0.0092 0.0100 0.0043 0.0014
O1    .0094  .5682  .1572      0.0102 0.0115 0.0137 0.0009 0.0053 0.0024
O2    .6321  .0625  .1343      0.0104 0.0179 0.0142 0.0030 0.0071 0.0081
O3    .6915  .4557  .0501      0.0086 0.0112 0.0084 -.0001 0.0033 0.0005
O4    .9672 -.0987  .2191      0.0116 0.0085 0.0077 0.0016 0.0035 0.0001
O5    .8564  .1810 -.0651      0.0120 0.0164 0.0103 0.0014 0.0055 0.0044
O6    .9545  .2625  .2764      0.0145 0.0117 0.0073 -.0023 0.0009 -.0005
O7    .2959  .7292  .4207      0.0122 0.0186 0.0134 -.0010 0.0047 -.0039