What type of mineralogical objects, often called 'blueberries,' did *Spirit* discover that suggested flowing liquid water?

Answer

Hematite Spherules

Early in the mission, *Spirit* found small, grey, marble-sized objects referred to as 'blueberries,' which were confirmed to be rich in the mineral hematite, typically forming when water precipitates minerals out of flowing liquid on Earth.

What type of mineralogical objects, often called 'blueberries,' did *Spirit* discover that suggested flowing liquid water?

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