A first for me.

[Neogeo]

I have found lots of these type fossil in creeks and such here in Cen.Tex..But never one filled with crystals.....
I cleaned up the fossil with some light vinegar & water and hit it with the ol'tooth brush.

 

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[Gecko]

I have found lots of these type fossil in creeks and such here in Cen.Tex..

Aloha NeoGeo
What kind of fossil is it?

 

[BJS in Iowa]

Looks like a geode to me. Not a fossil. Google geode.

 

[QuarterMaster]

Looks like a calcite geode TPWD: Geodes -- Young Naturalist