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German geologists Thursday said they have discovered in India one of the world's rarest rocks, dating back to the birth of the planet when the Earth was covered with a hot ocean of melted stone.
The fragment from the primeval crust is only the second ever discovered, said scientists at the University of Muenster.
The upper part of the mantle is composed mostly of peridotite. A peridotite is a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene. Peridotite is ultramafic and ultrabasic, as the rock contains less than 45% silica....
, a rock denser than rocks common in the overlying crust. The boundary between the crust and mantle is conventionally placed at the Mohorovicic discontinuity
Originally posted by muzzleflash
the rock may be rare but i seriously doubt their assumptions of it's age and it's origins
i just dont put much faith into their "assumptions" or "pseudo-facts" anymore
don't blame me though, it was their fault for talking up their finds to increase funding, etc