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The large scale modern configuration-interaction shell model with realistic effective Hamiltonians is used to study nuclear clustering phenomena. The many-nucleon configurations and the corresponding fractional parentage and cluster coefficients are used to build the translationally invariant wave functions of the alpha-cluster channels. The cluster spectroscopic factors satisfying the orthogonality conditions of the respective cluster channels are evaluated. The presented study of 16O exemplifies the approach. The distribution of clustering and electric quadrupole strength is examined. The results are compared with the experimentally available data.