Do Zeolites Have Negative Poisson's Ratios?

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Lattice Metamaterials with Mechanically Tunable Poisson’s Ratio for Vibration Control (2017, unknown): “Auxetic behavior has been observed in a variety of natural systems, including cubic metals [36], zeolites [37, 38], natural layered ceramics [39], silicon dioxides [40], single-layer graphene [41, 42], and 2D protein crystals [43].”
Experiments and parametric studies on 3D metallic auxetic metamaterials with tuneable mechanical properties (2015, background): “sieves [13], seat cushions [14], superior vibration dampers”
Auxetic behaviour from connected different-sized squares and rectangles (2011, background): “1991; Alderson 1999; Evans & Alderson 2000) and to act as smart filters (Alderson et al. 1998a, 2001; Grima et al. 2000; Ravirala et al. 2005).”
Mechanical metamaterials associated with stiffness, rigidity and compressibility: a brief review (2017, background): “Rotating hinged triangle and square structures (lower) [337,338,340].”