Argillite rock on display outside Riverton Aparima Museum. Source: http://www.stuff.co.nz/southland-times/news/4554948/Rare-Riverton-rocks-attract-big-interest
arg Rvtn Ap
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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)