Polished Algae That Has The Look Of A Stone Sculpture?

But on first viewing it looks like sand ! Such as Curiosity Rover tracks !
Another Nasa reveal ?
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August 24th, 2016

http://mars.jpl.nasa.gov/msl-raw-images/msss/01221/mcam/1221ML0056000260503647E01_DXXX.jpg

ZOOM in to see that the texture is not SAND !

Here is a texture, when I first saw it I would swear it was sand, but look close at the texture. Notice how it has a polished granite look in sculpture form. Maybe it's of algae and is molding like a plastic, or a Corian look etc. But upon a closer look, it sure doesn't have the look of sand! Rather that the sand is covering it and the polished smooth stone look in sculpture form seems to shine through, that is unless Nasa is playing tricks. Or this is a bit of their revealing process of a current creative civilization !