Help identifying this?

[tokimom88]

I found this today on a trail in Ontario, Canada. Can anyone help me identify what it is?

 

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[Back-of-the-boat]

Look up citrine quartz, it bears some resemblance but it looks like it may have been tumbled in a river to have that smoothness. Not sure just an idea.

 

[antmike915]

It does have a polished quartz look to it.

 

[DDancer]

River tumbled quartz possibly. In the third picture it looks kinda like an agate with a citrine core but in the other photo's I can see rock crystal and some faint outlines of small crystals in the matrix. Its pretty buffed so I'm curious if its naturally like that or its a drop from some other hiker. Nice though.