Hello All, found this one in a zeroscaped commercial property. What's this rock?

[The Duke]

Found this one in a pile of river rocks used to zeroscape around a commercial building. Any ideas what it might be?

 

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[vpnavy]

I noticed this was your very first post - so, Welcome Aboard The Duke! Take a look at Sub-Forums: Colorado for information (i.e., clubs, etc.) directly related to your state.

 

[RelicHunterPro]

I'm thinking the rock has green calcite in it