Why did some people in the pompeii have green on there bones?

The green color on the bones of some victims of the Pompeii eruption is due to the presence of a mineral called celadonite. Celadonite is a potassium iron silicate that is typically found in sedimentary rocks. It is thought that the celadonite in the bones of the Pompeii victims was deposited by water that seeped into the ash and pumice that buried the city. The celadonite was then absorbed into the bones, where it reacted with the calcium phosphate to form a green mineral complex.