Unknown Rock, Possible Artifact

[PointyRockHunter]

Happened upon this rock a while back but still puzzled as to what it might be. I'm mostly a Native American artifact hunter so you can see why I just had to pick it up lol. Strange shape as if someone made it that way, and if not by some natural means there are 3 scratch/tally marks on the top side showing weathered patina, so I don't believe their are recent. The dimensions are
5 1/2 inches long, 1 1/4 wide and 1 1/4 tall, also weighs 13.2 ounces. Seems to have a very tiny reaction to magnets and doesn't leave a mark on paper. Brown outer crust with black core. Any help will be appreciated, Thanks

 

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[fuss]

Interesting, can you scratch the black with a knife?

 

[PointyRockHunter]

Just tried it and it will scratch with a knife. The scratched mark is silver\whitish in color.

 

[stdenis_jd]

That rock didn't scratch, that's metal remnants from the knife meaning the rock is harder than the knife's steel. It's probably a chert nodule/concretion. No idea if it's an artifact, you'd have to post on the artifact section to get better advice on that

- and the outer layer is probably limonite, maybe enough iron in it to weakly attract a magnet

 

[PointyRockHunter]

Thanks stdenis-jd for the information! I thought the same when I first scratched it, dang China made blade lol, but it did leave a indentation and the residue coming off is whitish. I could see it as a tool serving many purposes. A friend said he thought it might be a prime get outta here rock, the Native Americans would throw it at someone they didn't like while shouting get outta here lol