ff

 &control
    outdir='C:/Users/barneslab/QE/out'
    prefix='magnesite',
 /
 &system
    ibrav= 4, a=4.6330, c=15.0160, nat=  15, ntyp= 3,
    ecutwfc = 12,
 /
 &electrons
 /
ATOMIC_SPECIES
 Mg  24.305 Mg.pw91-np-van.UPF
 C   12.011 C.pw91-van_ak.UPF
 O   15.999 O.pw91-van_ak.UPF
ATOMIC_POSITIONS
 C       0.000000    0.000000    3.754000
 O       1.291541    0.000000    3.754000
 O      -0.645771    1.118508    3.754000
 O      -0.645771   -1.118508    3.754000
 Mg      2.316500    1.337432    5.005333
 O       3.987229    1.118508    3.754000
 O       1.670729    2.893788    3.754000
 O       3.341459    2.674864    6.256667
 O       0.645771    1.556356    6.256667
 O       2.962271   -0.218924    6.256667
 Mg     -0.000000   -2.674864    5.005333
 Mg     -2.316500    1.337432    5.005333
 Mg     -2.316500   -1.337432    2.502667
 Mg      2.316500   -1.337432    2.502667
 Mg      0.000000    2.674864    2.502667
K_POINTS automatic
  2 2 2 0 0 0