Consists of a scheme $X$, satisfying the following properties:

$X$ reduced, not regular, connected, all stalks of the structure sheaf are irreducible, affine, finite dimensional, excellent, quasi-compact, locally noetherian, irreducible, normal, pure dimension 2, noetherian, all stalks of the structure sheaf are domains, dimension 2, separated, integral

By the theorems, we also have {"X": {"quasi-separated": true}}