Page 36 of Jocelyn Thornton’s (1985) “Gemstones”. Source: https://www.onnaturesedge.co.nz/downloads/nzgemstones.pdf
Thornton 1985 p36 Orepuki pebbles
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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)