Featured on the Cover: May 1999
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. The cover was designed by Betsy True.

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