Diamonds from SA mine contain 'almost impossible' chemistry: Study
Diamonds from South Africa's Voorspoed mine contain the first natural evidence of nickel-rich metallic alloys forming 280–470 km deep in Earth's mantle, a study found. These inclusions, found with nickel-rich carbonates, capture a rare "redox-freezing" reaction where oxidised melts meet reduced rock. The combination is so unusual that researchers thought their coexistence was "almost impossible".