What is this rock?

[Nadine]

Hi all. I'm Nadine and this is my first post.
I came upon this specimen, and several others like it, in the dumpster. I live in Colorado and a local mom & pop Jeweler's shop recently closed due to the owners passing. When the family cleaned out the shop they threw away countless things of value so I thought there might be a chance these rocks have gold in them. Who knows where they might have originated from.

 

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[djackson7348]

Sorry but i don't know much about geology Nadine, but welcome to the forum from North Carolina!

 

[Nadine]

Hey, thanks.