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I was working in my front yard in Tulsa Oklahoma and ran over this rock with my lawnmower. It was logged in the ground enough I didn’t see it.

  • It’s 2.5 inches in length.

  • Black in color with what appears to be rust or oxides spots. Also,
    little bits of quartz or crystal.

  • The texture I would describe as lava(flow) like.

  • It is not magnetic but it feels very dense. Feels a lot heavier than a normal rock that size.

  • It is very hard.

I hit it with my lawnmower blade and it barely chipped it. Also, I had mowed the yard a week and a half to 2 weeks before that and it wasn’t there. My yard is completely secure with s wrought iron fence and no one can access where it was found.

I appreciate the help.

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  • $\begingroup$ I only see sedimentary rocks at Tulsa. ogs.ou.edu/docs/OGQ/OGQ-85-color.pdf Did you found it close to Kansas river? There is volcanic activity at Kansas bbsradio.com/cgi-bin/webbbs/webbbs_config.pl?md=read;id=11828 $\endgroup$ – Universal_learner Mar 31 at 11:28
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    $\begingroup$ An absolute value of density may help. for weigth you can use any weigth machine and here is some information to measure volume earthscience.meta.stackexchange.com/questions/1663/… $\endgroup$ – Universal_learner Mar 31 at 11:29
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    $\begingroup$ is it possible to chip off a piece to see if it have the same color inside the rock as it have on the surface. $\endgroup$ – trond hansen Mar 31 at 11:52
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    $\begingroup$ I think @UniversalLearner is referring to the Arkansas river. $\endgroup$ – Spencer Mar 31 at 21:58
  • $\begingroup$ Yes it is the same black color under the surface. Something else strange about it. Is it is it seems to have be used as a tool for smoothing it scraping. It has a flat bottom an another flat angle coming off that with a perfect thumb groove. $\endgroup$ – bburgess42 Mar 31 at 23:11

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