fairly smooth Found in Texas San Antonio

Has Layers scratched with a steel object no sand was created

I have found this strange rock on my way home it piqued my interest so I picked it up did some research and found little to nothing. Might be related to shale not sure though. What is this strange rock? not magnetic


closed as off-topic by Leukocyte, uhoh, Peter Jansson, Jan Doggen, arkaia Jul 13 at 15:54

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  • 4
    $\begingroup$ Looks like chert/flint. $\endgroup$ – The Garage Chemist Sep 23 '17 at 15:45
  • $\begingroup$ Not as strange as you think. It's chert, one of the most common rocks on our planet's surface. $\endgroup$ – Gimelist Sep 24 '17 at 11:10

It looks like a piece of chert and maybe related to nearby limestone formation. What state/province and country did you find it in and where (in a stream, along a road or railroad, or hiking trailing?


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