 21
Cr_3 Si & Pm(-3)n-O_h^3 #223 & A15 & cP8 & Nevitt, Ch. 13 in Westbrook         
Si     0.00000000     0.00000000     0.00000000
Si     2.27500000     2.27500000     2.27500000
Cr     1.13750000     2.27500000     0.00000000
Cr     3.41250000     2.27500000     0.00000000
Cr     0.00000000     1.13750000     2.27500000
Cr     0.00000000     3.41250000     2.27500000
Cr     2.27500000     0.00000000     1.13750000
Cr     2.27500000     0.00000000     3.41250000
Si     0.00000000     0.00000000     4.55000000
Cr     1.13750000     2.27500000     4.55000000
Cr     3.41250000     2.27500000     4.55000000
Si     0.00000000     4.55000000     0.00000000
Cr     2.27500000     4.55000000     1.13750000
Cr     2.27500000     4.55000000     3.41250000
Si     0.00000000     4.55000000     4.55000000
Si     4.55000000     0.00000000     0.00000000
Cr     4.55000000     1.13750000     2.27500000
Cr     4.55000000     3.41250000     2.27500000
Si     4.55000000     0.00000000     4.55000000
Si     4.55000000     4.55000000     0.00000000
Si     4.55000000     4.55000000     4.55000000
