Jocelyn Thornton’s “Gemstones”, pages 30-31 in book, page 15 in online version https://www.onnaturesedge.co.nz/downloads/nzgemstones.pdf
dedrites p30 Thornton a
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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)