What kind of "rock" is this?

[bikesnbuses]

I picked this up at a yard sale as a shelf sitter/paper weight ..Is it some kind of under water volcanic lava ?? Just thought it was pretty cool for $1

I figure when Im unsure what something is ,Ill always try the people on the Samba
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[busdaddy]

Any strange dissapearances in town lately?

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[bikesnbuses]

Unfortunately..SOME people are still here..
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[hazetguy]

looks like slag from an ironworks

[doc1369]

May be fossil coral? Really efin cool what ever it is. I'd buy that for a dollar.
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[Letterman7]

Looks like a geode that hasn't been cut and polished to me..

[Dave]

Looks sorta like a Geode, although I have never seen one with that "decoration" usually they are crystalline insde, with nothing hanging out...
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[jmartin7]

I think your own assumption was correct. I would think that an underwater lava rock would be smooth on the inside like that from slow and undisturbed cooling and rough on the outside from cooling quickly from the water and rolling around some while still soft.

Here is what google showed me a lava rock was it looks similar:

[Daniel G]

I used to collect rocks when I was a kid...I found some similar to that on an old railroad bed and couldn't figure out what they were for years. I believe that is glass....Probably from the dirt melting into glass when the tracks were welded together with thermite. Or as Hazetguy said it could be slag...
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[dubllyou]

It's an agate geode. Technically geode means hollow rock, so there's probably some other identifying name that should go with it as to what type of agate. My Granddad was a lapidary.

I'm pretty sure I've got a fossilized dinosaur egg... that's what he called it. I found it on the property after my Grandma passed away. She wouldn't let him keep it in the house.
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[Iowa Mark]

Meteor shit!

http://www.youtube.com/watch?v=zPpQCarlncY

[hitest]

^^^awesome!

Me thinks it is a geode as well. Growing up, Grandma had one on her porch- probably 10" diameter. She was into displaying these things- and would send them to be polished.
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[bikesnbuses]

Heres another one I got at the same yardsale..I think?..Just a regular rock with awesome ocean erosion/wear? .Deeeep holes in 2 spots,kinda weird?

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[minger]

Pretty sure that is a Yeti pelvis bone. You can see the sockets for the hip bones. Dead give away. I'd call CoastToCoastAM if I were you.

[BUSLUVR42]

I've seen formations like that before, but nothing that severe. It's like a hydraulic drilling. The rock sits in the bottom of a fast moving river for MANY years, the water creates mini whirlpools and eddies that pick up sand and grit that slowly drills into the rock. There are some great examples downstream of Niagara Falls. Also, how there are no sharp points makes me believe that it was naturally eroded in water, like how most river rocks are almost polished smooth.
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[DWP]

I finally had a chance to check with the Geology dept at work. What you have is a piece of Chalcedony. Google images of it.
The blue variety is really cool.
DWP