Author: Roger Lawrence Gibson, Professor of Structural Geology and Metamorphic Petrology, University of the Witwatersrand

On a Sunday morning in late August 2024 a nine-year-old girl named Eli-zé du Toit was sitting on her grandparents’ porch near a small town in South Africa’s Eastern Cape province, when she heard a long rumble, then heard a rustling in a nearby fig tree. As she watched, a rock fell out of the tree. When Eli-zé picked it up, she noticed that the rock had a black crust and a grey interior “like concrete”. It was warm on the crust and cold on the inside. Elsewhere in the Eastern Cape, videos and photographs on social media of a…