One Loose

The Blue Vivianite Man: When Geology Preserves a 300-Year-Old Mystery In 1996, an extraordinary discovery was made in Lake Brienz, Switzerland: human remains covered in striking blue-green mineral crystals. The remains belonged to a man believed to have died during the 18th century. Researchers identified the unusual crystals as vivianite, an iron phosphate mineral. But how did they form? As the body decomposed, phosphorus released from bones and soft tissues interacted with iron in the surrounding water and sediments. Under suitable low-oxygen conditions, this chemical process allowed vivianite crystals to develop around the remains. Vivianite is particularly fascinating because it can initially appear pale or nearly colourless before turning deep blue or green as it oxidises. This remarkable discovery brought together forensic science, mineralogy and archaeology, revealing how the chemistry of nature can preserve traces of human history for centuries. Sometimes, even after 300 years, the Earth still has a story to tell. Mineral: Vivianite Formula: Fe₃(PO₄)₂·8H₂O Location: Lake Brienz, Switzerland Discovery: 1996