Rapa Nui/Easter Island moai with red scoria pukao on its head https://en.wikipedia.org/wiki/Scoria. This is a close up of the moai at Ahu Tahai, restored with coral eyes by the American archaeologist William Mullo.
rapanui
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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)