Ruby-forming mineral found by Mars rover hints at violent impacts
So far, most of the minerals found on Mars tell a story of lava poured out by ancient volcanoes, followed by long stretches in which water trickled through and slowly reshaped the rock. However, some rocks scattered across the Martian surface seem to hint at a different geological history—carrying the same material that forms rubies and sapphires.
NASA’s Perseverance rover has discovered a mineral resembling rubies and sapphires on Mars, suggesting violent meteorite impacts played a significant role in shaping the planet’s geological history. While most Martian minerals indicate volcanic origins followed by water reshaping, scientists found small, pale rocks with a composition similar to corundum on the rim of Jezero Crater.
This mineral, which typically requires specific ratios of aluminum and silicon, was found alongside a silica-rich mineral that would have used up the aluminum first. The team hypothesizes that the high-temperature, high-pressure conditions generated by a massive meteorite impact could have transformed the rocks’ chemical composition.
The rocks’ small grain size, location on the crater rim, and proximity to other rocks further support this violent origin story. As these findings point to meteorite impacts contributing to the planet’s geological evolution, astronomers may use such mineral signatures to uncover more ancient secrets on Mars.
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