On Oct 30th 2016, using its Mastcam, Curiosity captured this image of a
smooth, golf-balled sized rock -
http://photojournal.jpl.nasa.gov/fig...21134_fig1.jpg
The array of brighter points visible on the rock resulted from laser zapping
by Curiosity's Chemistry and Camera (ChemCam) instrument.
It has confirmed that it is an iron-nickel meteorite.
Story here at JPL web site -
http://www.jpl.nasa.gov/spaceimages/...hp?id=PIA21133
and here -
http://photojournal.jpl.nasa.gov/catalog/pia21134