What is this????

[brentbam12]

I found this in Grapevine TX. I found it intact but when I tossed it in my cupholder in the truck it split in two to find it hollowed out. Any ideas?? It is about 2 inches long and an inch in diameter.

 

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[kuger]

geode

 

[DCMatt]

Stone? Metal? Ceramic? What's it made of? Can't tell much from your pics...

DCMatt