What is the charge of Silicon dioxide? What is the charge of Silicon dioxide ions? I can't find it anywhere.

It seems to be 0?

Also is there anywhere I can find these on my own?
Like what @GeoffHutchison said,

$\ce{SiO2}$ is not an ion. It is a network solid. Its net charge is zero.

From charge balance, since oxygen holds a -2 formal charge, then silicon must hold a +4 formal charge in order to balance out. $(+4) + (+2 \times -2) = 0$