Middle left - looks too rough to be sheared off flint:
mars.jpl.nasa.gov/msl-raw-images/msss/00003/mcam/0003ML0000094000E1_DXXX.jpg
(, Sun 12 Aug 2012, 16:06, Reply)
I'm more interested in the hexagonal-looking bits with the round indentations in the middle
/tinfoils
(
Richard Shitheels, Sun 12 Aug 2012, 20:19,
Reply)