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Martian spherules are small spherules that are rich in an iron oxide and are found at Meridiani Planum in mind-bogglingly large numbers.
Loose hematite spherules at Eagle Crater. Spherule diameters are 3-6 mm.
Close-up of sediment matrix with embedded hematite spherules at Eagle Crater. The central spherule is 3.7 mm in diameter.
Small, loose hematite spherules northwest of Victoria Crater. Spherule diameters are 1 - 2 mm.
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