What kind of stones are they?

[Unitedstatesofamerica1]

 

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[Indian Steve]

I believe they are well worn broken pieces of Milk of Magnesia bottles. Looks like they were tumbled in a creek.

 

[Rasputin]

Ocean tumbled glass. Where did you find these?

 

[SorenCoins]

wow really nice old cobalt glass . It has been tumbled in water

 

[omurcelik]

sea glass