We propose that baryonic matter consists of frozen remnants of the pre-crystallization vacuum phase, trapped as topological defects within a K = 12 Face-Centered Cubic (FCC) lattice [2]. In the Selection-Stitch Model (SSM), the early universe undergoes a thermodynamic K = 4 →K = 12 phase transition [3]. Incomplete crystalliza- tion leaves isolated K = 4 tetrahedral voids permanently embedded in the K = 12 bulk. We demonstrate via computational crystallography that these tetrahedral de- fects recover the exact properties of quark structure. Each void is bounded by four cuboctahedral cells committing three bonds each, yielding the K + 1 = 13 struc- tural nodes required by the 1836 proton mass formula [4]. The FCC cubic symmetry splits the four bounding vertices into one corner and three face-centers, producing a strict 1 + 3 valence-anchor decomposition. Evaluating the bond asymmetry ra- tios between these sites recovers the +2/3 and−1/3 fractional charges [6]. This assignment generates the uud proton, the udd neutron via spatial inversion, and naturally predicts the uuu (∆++) resonance. The internal tetrahedral bonds map exclusively through non-bipartite triangular faces, enforcing color confinement by preventing electromagnetic flux separation [10]. Every result follows strictly from FCC geometry without adjustable parameters.