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A Very Rare Mineral On Earth, Called Jarosite, Known To Be Found Around Volcano Vents And In Exposed Mining Wastes, Was Recently Discovered In Antarctica. This Discovery Is Interesting Because Jarosite Is Abundant On Mars, Which May Hint At Almost The Same Environmental Conditions Existing On Both Mars And In The Deep Antarctic Ice.

Martian mineral, rare on Earth, found locked in Antarctic ice | Space

https://www.space.com/martian-mineral-in-antarctica.html

Scientists boring more than a mile deep into Antarctic ice have unearthed a mineral that’s rarely seen on Earth but found in abundance on Mars.