"Egg Rock" is a smooth, shiny nickel-iron meteorite found sitting on the surface of Mars on Curiosity's Sol 1505, or 30-Oct-2016. It is described the next day in Arizona State University's Red Planet Report website: Curiosity: Egg Rock, a small meteorite
Did Curiosity's software flag it as potentially interesting (e.g. "hey, what's that?) or was it noticed/spotted first by researchers, who then directed Curiosity to take a closer look?
See also:
- Debora Bird in Earthsky.org: Curiosity Finds Small Meteorite on Mars
- Gizmodo: Curiosity Just Found A Freaky Metal Meteorite On Mars
Images from EarthSky, credit NASA/JPL/ASU, captions "October 30, 2016 image via Curiosity rover on Mars" (click for larger size):
