Please help ID. From Dallas Texas

[heperd]

Found in Chalk Hill /Eagle Ford area in Dallas when i was a kid. I broke open a rock w another rock and this was inside. Does anyone what kind of rock or crystal it is? Any help is appreciated.

 

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[Eu_citzen]

Could be calcite - a quick dip in citric acid should tell. Wash it afterwards in water.

In acid (most acids really) it should begin to bubble.