What colour is Mercury ( planet )?

[tgh1020]

What colour is Mercury? Not element. The planet.

http://www.astromax.org/planets/images/NASA-mercury_small.gif
or
http://www.fortunecity.com/roswell/milkyway/1000/images/mercury.gif

and which on of these are mercury?
http://www.mariewinn.com/marieblog/uploaded_images/Scale-Model-Jupiter,-Saturn,-Uranus,-Neptune,-Earth,-Venus,-Mars,-Mercury,-the-Moon...-775870.jpg

Thanks everyone!

 

[Grace]

Mercury has a dark gray rock surface covered with a thick layer of dust.