NASA has found a rock on Mars that it has dubbed Skull Hill. The rock is known as a "float rock," and NASA has no idea where it came from.

"Alternatively, ‘Skull Hill’ could be an igneous rock eroded from a nearby outcrop or ejected from an impact crater," Deahn continues. "On Earth and Mars, iron and magnesium are some of the ...

"However, recent analysis of SuperCam data from nearby similar rocks suggests a composition inconsistent with a meteorite origin," NASA wrote. The research team estimates that Skull Hill is a ...

"The pits on Skull Hill may have formed via the erosion of clasts from the rock or scouring by wind," NASA said. "Alternatively, 'Skull Hill' could be an igneous rock eroded from a nearby outcrop ...

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Alternatively, NASA speculated that "Skull Hill" could be an igneous rock, potentially eroded from a nearby outcrop or ejected from an impact event. Interestingly, the team observed that the color ...

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After dealing with the constituents (minerals), and their relations (textures), he gives in summary some twenty-five systems of classification of the igneous rocks. As many of these are now of ...