From Te Aro, The Encyclopeadia of NZ. https://teara.govt.nz/en/photograph/5121/greywacke-pebbles-with-quartz-veins
1 greywacke
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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)