Monticellite
Sharp Z D, Hazen R M, Finger L W
American Mineralogist 72 (1987) 748-755
High-pressure crystal chemistry of monticellite, CaMgSiO4
Sample: P = 20.7 kbar
_database_code_amcsd 0001099
4.800 11.004 6.346 90 90 90 Pbnm
atom     x     y     z Biso
Mg1      0     0     0  .93
Ca2  .9748 .2766   .25 1.00
Si   .4116 .0801   .25  .86
O1   .7412 .0773   .25 1.22
O2   .2464 .4477   .25 1.15
O3   .2722 .1482 .0447 1.14