What is this?

[Kevinrose.1]

Found while searching for cool rocks. New at this. Had a question answered yesterday. So figured id ask again. What this may be. Bout the size of a dime. Found in the yellowstone river. Was there looking for agates and possible sapphire? Again i dont really know much about rocks. But am curiouse if you folks can help identify.

 

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[FreeBirdTim]

Looks like milky quartz to me.

 

[vpnavy]

..: Moved from Today's Finds! over to Geological > Rocks/Gems for more exposure :..​

 

[Eu_citzen]

Quartz.