unknown rock??

[RockAli]

I found this rock in the backyard of a late collector it was left as trash. It looked to cool. Any thoughts?? It weighs 101 grams. Thank you

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[rock]

River or lake sediment from what I can see. Glad you like it

 

[DDancer]

Never seen sediment look like that~ I've picked up similar looking stones in the past. usually they are microfine quartz or chalcedony. The rounded shape is most likely due to the specimen having formed in a vug in the host rock and the host rock having eroded away leaving the harder material. If you take a jewelers loop and look at the patterned side of the piece you will see crystal shapes. Be nice if you could post a magnified view.
*looks at rock* I could have formed in a sedimentary material but I'd be more willing to say it formed in a volcanic material as round vugs occur more commonly in such materials.

 

[RockAli]

I found this rock in the backyard of a late collector it was left as trash. It looked to cool. Any thoughts?? It weighs 101 grams. Thank you

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=1006531"/>

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=1006532"/>

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=1006534"/>

Thank you for your advice. I will try to get a picture magnified

 

[RockAli]

Here are a couple of close up pics..I was thinking possibly a glacier rock

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[DDancer]

Its always possible it was transported by a glacier if you live in an area known for moraines. Generally only the hardest materials survived glacial transport an have a tendency to look much like river stones. Rocks move in a lot of ways