An assortment of angular grains in a fine-grained clay – greywacke under a microscope. Source: https://teara.govt.nz/en/photograph/9065/greywacke-under-the-microscope
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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)