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Washington,Jan 18:-- Coesite is a polymorph of silica that only forms under extremely high pressure - 10,000 times more on average than normal atmospheric pressure. The presence of this rock at a site indicates either that material has pushed up through Earth's crust from the mantle (a silicate rocky shell between the crust and the core with an average thickness of 2,886 km and depths ranging from 30 km to almost 3,000 km below the crust) or that a celestial body (a comet, meteor or meteorite) [...]