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To me, it resembles the so-called "Martian Blueberries" still attached to a thin piece of rock. The thin rock may have originally been part of another rock from which it broke off or is just what's left from erosion leaving it in a weird shape. If you look at the image, especially in the upper right and lower right, you can see thick clusters of Martian Blueberries (hematite), as well as scattered around the entire image. Hematite is a primary ore of iron and a pigment mineral. In other words, it's pretty hard. The flat part the hematite is attached to might be something similar to sandstone. Hematite is significant because it indicates that Mars once contained surface or standing water.
Whether or not things like this are real artifacts or just rocks is anyones guess.
Anyone else ever hear that Rush Limbaugh comment from the 1990s about Mars once having life and what became of them? I cannot recall the episode number, but google knows, what he suggested is pretty bizarre if true.
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