Unit cell vectors:
va= 6.926  0.0  0.0
vb= 3.10954e-10  6.926  0.0
vc= 2.87787e-10  2.87787e-10  6.41
15
O  1.31455  1.02164e-10  2.27555 
O  4.37557e-10  5.61145  4.13445 
O  2.44642e-10  1.31455  4.13445 
O  5.61145  1.02164e-10  2.27555 
O  1.31386  1.31386  0.0 
O  1.31386  5.61214  0.0 
O  5.61214  1.31386  0.0 
O  5.61214  5.61214  0.0 
O  3.463  3.40452e-11  0.758303 
O  4.09219e-10  3.463  5.6517  
Si  1.85548  3.4074e-11  0.758944  
Si  4.81362e-10  5.07052  5.65106  
Si  3.37018e-10  1.85548  5.65106  
Si  5.07052  3.4074e-11  0.758944  
Si  1.43894e-10  1.43894e-10  3.205