A specimen of rhyolite. Source: https://sites.pitt.edu/~cejones/GeoImages/2IgneousRocks/IgneousCompositions/7Rhyolite.html
Rhyolite
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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)