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What is this mystery rock that 'appeared' near the Opportunity rover on Mars?

Comparison image showing the before and after photos of the mystery rock "Pinnacle Island." The after image is the same patch of ground as in the inset box in the before image.
Comparison image showing the before and after photos of the mystery rock "Pinnacle Island." The after image is the same patch of ground as in the inset box in the before image.
NASA/JPL-Caltech/Jason Major
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