Weird object found on the surface of Mars

On November 27, 2014 Mars Rover Curiosity captured this strange object.

Maybe it’s a broken part of a machine, vehicle or extraterrestrial spacecraft, but really, I have no explanation what this object could be. 

What do you think?

SOL 821 - Mastcam: Right - 2014-11-27 20:06:02 UTC
Link to the original image:
http://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=0821MR0036170080500530E01_DXXX&s=821