Amygdaloidal basalt, inflilled with chalcedony and pumpellyite (the dark green centres), Michigan USA. Source: http://www.mindat.org/photo-1137644.html
amyg basalt chalc pmp
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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)