Melilite Armbruster T, Rothlisberger F American Mineralogist 75 (1990) 963-969 Crystal growth and structures of mixed-anion silicates-germanates: Ca5[(Ge,Si)2O7][(Ge,Si)O4] and Na2Ca6[Si2O7][SiO4]2 sample Ca5Ge2.23Si.77O11 _database_code_amcsd 0001318 10.912 8.695 11.000 90 96.87 90 C2/m atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Ge1 .5606 0 .2709 .73 0.0045 0.0125 0.0081 0 0.0001 0 Si1 .5606 0 .2709 .27 0.0045 0.0125 0.0081 0 0.0001 0 Ge2 .8106 0 .4631 .81 0.0094 0.0059 0.0068 0 -.0009 0 Si2 .8106 0 .4631 .19 0.0094 0.0059 0.0068 0 -.0009 0 Ge3 .7947 0 .0177 .69 0.0044 0.0079 0.0083 0 -.0002 0 Si3 .7947 0 .0177 .31 0.0044 0.0079 0.0083 0 -.0002 0 Ca1 -.0162 0 .2497 0.0060 0.0292 0.0077 0 -.0008 0 Ca2 .2701 .1876 .2436 0.0092 0.0073 0.0167 -.0020 -.0043 0.0010 Ca3 0 .2890 0 0.0161 0.0298 0.0113 0 0.0050 0 Ca4 .5 .1768 .5 0.0212 0.0208 0.0233 0 -.0023 0 O1 .4187 0 .3234 0.005 0.016 0.014 0 0.001 0 O2 .8536 .1540 .1035 0.010 0.012 0.012 -0.002 -0.001 -0.002 O3 .8701 .1546 .3925 0.011 0.008 0.014 -0.002 0 0.003 O4 .8570 0 .8795 0.017 0.016 0.014 0 0.007 0 O5 .6490 0 .4208 0.010 0.018 0.009 0 0.000 0 O6 .1648 0 .3813 0.004 0.023 0.012 0 -0.002 0 O7 .8594 .5 .0267 0.013 0.012 0.050 0 0.007 0 O8 .5889 .8281 .2070 0.016 0.032 0.020 0.011 -0.008 -0.012