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A good geology student will tell you that such a texture indicates the rock formed when crystals grew and settled in a slowly cooling magma -- for example a thick lava flow, lava lake, or magma chamber, the rock was then altered by water several times, making it a treasure trove that will allow future scientists to date events in Jezero Crater, better understand the period in which water was more common on Jezero Crater surface, and reveal the early history of the planet. Mars Sample Return is going to have great stuff to choose from.