I found it in a gravel parking area at work (TN). It isn't magnetic and does not produce a streak. The surrounding rocks looked like they were "rusted" by these rocks. The rock on the left has a white powder substance covering parts of it.

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closed as off-topic by user12525, arkaia, Deditos, dplmmr, Erik Sep 6 at 20:57

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  • $\begingroup$ After a bit of research I'm fairly certain this is a matrix containing limonite. $\endgroup$ – Rafael Nov 9 '16 at 18:40
  • $\begingroup$ Or goethite - probably a surface coating of some kind of Fe oxy-hydroxide. $\endgroup$ – Gordon Stanger Nov 9 '16 at 22:25
  • $\begingroup$ @Gordon Stanger: seeing these are informational responses already, why not extend them out to be an actual answer, so the answer can be accepted. $\endgroup$ – JeopardyTempest Feb 25 '17 at 9:27