Researchers have investigated the remains of a man whose brain supposedly turned to glass during the eruption of Mount Vesuvius nearly two thousand years ago. Findings published in Scientific Reports indicate that the phenomenon was caused by rapid exposure to extreme temperatures during the volcanic event. The victim’s remains were buried in Herculaneum under volcanic ash where the brain tissue was exposed to temperatures exceeding 950°F and then cooled quickly, a process known as vitrification, which produces glass-like substances from organic matter.
Volcanologist Guido Giordano explained that while the thermoclastic flow from Vesuvius itself reached only 869°F, the hyperthermal ash cloud dissipated rapidly enough to create the necessary conditions for glass formation. The skull and spinal cord likely helped protect the brain from total destruction, enabling the vitrification process.
To arrive at these conclusions, Giordano and team conducted experiments on glass samples taken from the skull and spine to understand the temperatures involved in the transformation. They assert that brain tissue turns to glass at a minimum temperature of 950°F. Despite these claims, some scientists, including forensic anthropologist Alexandra Morton-Hayward from Oxford University, remain skeptical, arguing that soft tissue vitrification is "incredibly unlikely" and questioning whether the glassy material is truly brain tissue. However, Giordano maintains that the glass contains organic components, including neurons and proteins.
