This photo was taken on Mars November 11, 2014. It clearly shows an object that is not natural and is completely out of place. It appears to be extremely smooth and one end seems have a small cylinder-like opening that is perfectly circular. Whatever it is it is apparent it was not made by nature.
SOL 821 – Mastcam: Right – 2014-11-27 20:06:02 UTC
Link to the original NASA image: