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The cover shows a tremolite lattice. Opposing chains comprised 6-membered rings of polymerized SiO₄ tetrahedra, linked by octahedra and cross-linked by distorted cubic Ca²⁺ sites. The ability to zoom in, expand, rotate, and highlight atoms and symmetry-related groupings and to visualize such complex structures in stereo is a compelling reason for using computer models rather than hand-held mechanical models as discussed in the article "Interdisciplinary Learning with Computational Chemistry: A Collaboration between Chemistry and Geology" by Kenny B. Lipkowitz, Mehran Jalaie, Daniel Robertson, Andrew Barth (page 684). The image was provided by Daniel Robertson.