Gillespite
Hazen R M, Burnham C W
American Mineralogist 59 (1974) 1166-1176
The crystal structures of gillespite I and II: A structure determination at
high pressure
P = 26 kbar, known as gillespite II
7.349 7.515 7.894 90 90 90 P2_12_12
atom    x    y    z Biso
Ba      0    0 .000  3.0
Fe      0   .5 .185  1.6
SiA  .680 .215 .330  1.5
SiB  .270 .190 .290  1.4
O1   .255 .265  .48  5.0
O2A  .480 .215 .245  2.9
O2B  .245 .978  .28 13.3
O3A  .230 .635  .21 12.1
O3B  .145 .280 .155  1.9