Anyone seen a rock like this?

[wmvanrock]

Its about 5" long by 3" thick and the hole in it is filled with crystals.

 

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[eppingera]

It looks like banded agate to me

 

[galenrog]

From the images I would guess either a sedimentary rock or a flowstone. It has obvious weathering due to water or wind. Lacking an actual physical examination, I can offer nothing else.

 

[Eu_citzen]

I'd guess sandstone or quartzite.