746MH
SOL 746
ROUND BALL ON MARS
http://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=0746MR0032080400403454E01_DXXX&s=746
This image was taken by Mastcam: Right (MAST_RIGHT) onboard NASA's Mars rover Curiosity on Sol 746 (2014-09-11 14:46:58 UTC).
The
microscopic balls of iron hematite nicknamed ‘blueberries’ by NASA
are formed from a water born world, however not all the round balls
are hematite.