Unknown

[MEDIC517]

This was found near Adams Mills, Ohio in woods near a body of water. It floats in water.  Any ideas on what this is?

[Rockwood]

Slag would my first impression. Is the area known for iron working ?

[SilurianSalamander]

Pumice. Not a fossil. Still pretty

[debivort]

I've found rhyolitic pumice with a similar honeycomb structure. But that was from an obvious volcanic zone.

[Mark Kmiecik]

Discarded pumice. 

[Carl]

I agree with slag. I've never seen pumice with such spherical vesicles.

[Rockwood]

Kinda fun to imagine a big iron smelting caldron pouring out the bubbly foam. 

[MEDIC517]

Looks to be slag. Thanks for all the help.

[debivort]

Here's some Icelandic pumice for comparison. This piece is ~40mm long.

 

 

[Ludwigia]

I'm in the pumice camp. I find it hard to believe that slag would float or am I wrong there?

[Rockwood]

1 hour ago, Ludwigia said:

I'm in the pumice camp. I find it hard to believe that slag would float or am I wrong there?

Granulated blast furnace slag is listed as having a specific gravity of 2.08. Is over half the volume seen in the post contained in voids ?

If the example of pumice given is a positive example to be used as reference I think it seems likely.

[Al Dente]

A quick online search shows a lot of articles about injecting gases into slag to make it foam.

 

 

[minnbuckeye]

Ohio is known for their production of steel, not their vulcanism! I am of in the slag opinion.

[FranzBernhard]

11 minutes ago, Al Dente said:

A quick online search shows a lot of articles about injecting gases into slag to make it foam.

Really learned something new! But that´s an easy task .

It looks neither like typical pumice nor like typical slag, but a lot like these:

Foamed slag (link to google pic results).

Franz Bernhard