Can anyone tell me what this rock is?

Elliott was out exploring in the yard today and found a few of these rocks.. I've never really been a rock guy, so I'm not sure what they are..

He's driving me crazy because he wont let it go until he knows what it is...

I thought I would ask and see if anyone out there can identify this rock with a level of relative certainty.. Personally, I think it's quartz but he wants to be sure....

Thanks folks...

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