Page 7 of “Minerals from the Kakanui Volcanic Breccia: A 2017 Look at Geological Reference Materials for EPMA”. Source: http://www.geology.wisc.edu/~johnf/Fournelle_Kakanui_2017MM.pdf
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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)