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A long-standing problem of explicit microscopic description of a stable vacuum in a pure SU(3)   quantum chromodynamics (QCD) is resolved on a basis of stationary solutions possessing  local quantum stability against vacuum gluon fluctuations. A space of such solutions is factorized into two gauge and Lorentz invariant subspaces corresponding to non-Abelian color magnetic and electric  type fields respectively. Each subspace contains solutions which represent fixed points under the action of the Weyl color group. Such a symmetry allows to define classical colorless gauge potentials and a space of color singlet one-particle quantum states. We show that the the origin of color confinement phenomenon or spontaneous symmetry breaking is encoded in the structure of the gauge group SU(N). The Weyl symmetric solutions manifest an Abelian dominance phenomenon in the vacuum structure and  provides a consistent classification of physical states, i.e., pure glueballs. As an example, we construct a spectrum of lightest scalar glueballs. Implications in quantum gravity are discussed.