posted on Nov, 30 2012 @ 04:55 PM
reply to post by Juston
I am a geology student with my concentration in mineralogy. It looks like either graphite, galena, hematite, magnetite, or coal.
If it's graphite, it will leave dark grey marks on paper or just rub it with your fingers and it will rub off on your fingers.
If it's magnetite, it will be magnetic.
If it's coal, it will be extremely light in your hand making it feel almost like it is hollow (empty) on the inside. There are different kinds of
coal: bituminous, subbituminous, anthracite, and lignite.
My best guess is that it is galena though. I have quite a few galena sample of my own as it is one of my favorites.
Also, none of those I mentioned above are rocks. They are all minerals.