Node

Thank you 😇 to whomever nested my original 3 posts!

Small, Magnetic, Weathered or limited crust, has metal

Rock 2

Small, Magnetic, Crust, Metal mixed with stuff

Rock 1:

Tiny, Magnetic, no crust, visible metal.

On 7/16/2020 at 12:55 PM, Snoball Solar System said:

That's a greywacke river cobble, but the interesting thing is the nodular brown rock scale, on 'one side only'.

I suggest that the nodular brown rock scale is comet spatter delivered to southern WI by way of an eject curtain composed of ice sheet fragments, from a primary (Clovis comet) impact on the Laurentide ice sheet, 12,800 years ago.  The rock scale is on the side of the river rock exposed to the secondary impact, which is why the scale is on one side only.

These same massive ice sheet fragments are suggested by others to be responsible for creating the Carolina bays along the Atlantic and Gulf coasts.

I like the theory on this but the rock has the black crust on all sides.  It's just more prominent on two of the sides. the sides with less black crust seems to be more weathered as well. 

Correction.  This rock is not magnetic in that it attracts ferris metals, but it is magnetic in the sense it attracts a magnet.  

Not Magnetic

6 hours ago, 2Valen said:

Looks like regular old limestone that I see all the time around here in central Illinois.

 

With a blue interior?   

4 minutes ago, Node said:

Thanks HHH.  What type? Nitric, Hydrochloric, Sulfuric?   At what concentration? 

Too early.  Missed the HLC.  Dropped some 34% HLC onto the cut surface and no reaction was noted.

7 hours ago, Hardtimehermit said:

Looks like a volcanic rock, but maybe a limestone. Drop some acid on it hcl and if it  fizzes then it's limestone. 

Thanks HHH.  What type? Nitric, Hydrochloric, Sulfuric?   At what concentration? 

Found In southern WI.  Weird one due to the difference between the outside and window cut. Looks like there is some volcanic crust on the outside but a lot of it looks to be weathered away.

Last Closeup pic of the outside is not color correct due to the lighting used.  
 

Any help with its ID is surely welcome.