Similar stone in Jocelyn Thornton’s booklet, though this one is orbicular, not brecciated. https://www.onnaturesedge.co.nz/downloads/nzgemstones.pdf
a Thornton p36
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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)