White zeolite (stilbite) amygdale. Source: https://blogs.agu.org/georneys/2012/10/28/geology-word-of-the-week-z-is-for-zeolite/
zeo amyg
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A Blog About Stone Gathering, Tumbling and Polishing, and Rocks and Landscapes, from New Zealand – With Musical Interludes (john.tumblestone@gmail.com)