Calcite and zeolite (grey) filling an amygdale. Field of view = 7mm. http://www.alexstrekeisen.it/english/vulc/amygdales.php
amigdalevulcaniche234(4)
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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)