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My co-worker had this rock and told me found just behind the store, Big R, and put on the table in the office.

Location is Trindad, Colorado.

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  • $\begingroup$ Is there anything more you can add after reading this guide? $\endgroup$ – Jan Doggen Jun 15 '18 at 19:39
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Looks like slate to me. The geological map of Trinidad suggests that the local rocks are shale, which is similar to slate but less compact.

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