I found this stone whilst on safari in Nairobi. Can anyone help me identify it please?

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    $\begingroup$ Welcome to earthscience.SE. Please read this guide to asking rock identification questions and update your question with more information. $\endgroup$ – bon Mar 15 '18 at 22:08
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    $\begingroup$ to take better pictures,take the picture outside on a cloudy day or take the picture in the shade on a sunny day and remember to put some thing of known scale beside the rock. $\endgroup$ – trond hansen Mar 16 '18 at 7:50
  • $\begingroup$ @bon do you think we should make a separate tab for all these 'rock-identification' questions at some point? $\endgroup$ – Eevee Mar 16 '18 at 13:35