Disorder in frustrated quantum systems can critically influence their magnetic ground states and drive exotic correlated behavior. In the $S=\frac{1}{2}$ system ktenasite, ${\mathrm{Cu}}_{\text{2.7}}{\mathrm{Zn}}_{\text{2.3}}{\left({\mathrm{SO}}_{\text{4}}\right)}_{\text{2}}{\left(\mathrm{OH}\right)}_{\text{6}}·6{\mathrm{H}}_{\text{2}}\mathrm{O}$, we show that structural disorder drives an unexpected dimensional crossover and stabilizes a rare coexistence of distinct magnetic states. Neutron diffraction reveals significant Cu/Zn mixing at the Cu2 site, which tunes the ${\mathrm{Cu}}^{2+}$ sublattice from a two-dimensional scalene-distorted triangular lattice into a one-dimensional spin-chain network. Magnetic susceptibility, neutron diffraction, ac susceptibility, and specific heat measurements collectively indicate magnetic duality: a coexistence of incommensurate long-range magnetic order below $T_{\text{N}}=4$ K and a cluster spin-glass state with $T_{\text{f}}=3.28$ K at $\nu =10$ Hz. Our findings highlight ktenasite as a rare platform where structural disorder tunes the effective dimensionality and stabilizes coexisting ordered and glassy magnetic phases, offering a unique opportunity to explore the interplay of frustration, disorder, and dimensional crossover in quantum magnets.

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• Frustrated magnetism
• Disordered systems
• Minerals
• AC susceptibility measurements
• Magnetization measurements
• Neutron diffraction
• Specific heat measurements
• X-ray powder diffraction