Page 8 of online pdf of Jocelyn Thornton’s “Gemstones” (1985). Source: http://www.onnaturesedge.co.nz/downloads/nzgemstones.pdf.
thornton pdf 1 nn
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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)