What is this? Gem? Glass?

[Stogie91]

Found in a remote river on a mountain in the Cherokee national forest in East Tennessee, which is part of the great smoky mountains. Could use any advice out there.

 

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[austin]

Conchoidal fractures and what look like bubbles make me think it is water worn glass.

 

[Brian T. Booth]

Yup. Austin is correct. Glass

 

[wilfndgold1]