  We consider a new cooling procedure which separates gluon degrees of freedom
from singular center vortices in SU(2) LGT in a gauge invariant way. Restricted
by a cooling scale $\kappa^4/\sigma^2$ fixing the residual SO(3) gluonic action
relative to the string tension, the procedure is RG invariant. In the limit
$\kappa \to 0$ a pure Z(2) vortex texture is left. This {\it minimal} vortex
content does not contribute to the string tension. It reproduces, however, the
lowest glueball states. With an action density scaling like $a^4$ with $\beta$,
it defines a finite contribution to the action density at T=0 in the continuum
limit. We propose to interpret this a mass dimension 4 condensate related to
the gluon condensate. Similarly, this vortex texture is revealed in the Landau
gauge.
