Pages 18 & 19 of Jocelyn Thornton “Gemstones” (1985). Also online at http://www.peterthornton.com/files/nzgemstones.pdf
garnet thornton
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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)