Unknown rock

[Mooggie]

This was found in central Montana in a farm field. Any thoughts on what it is?

 

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[wvwildman]

slag from a coke oven maybe

 

[rock]

How big is it? Is it heavy or lite in weight?

 

[Mooggie]

I will post weight and dimensions next week after the holiday weekend.

 

[Mooggie]

It is very heavy and maybe 5-6 in in diameter.

 

[wvwildman]

ive got some just like it mine are the same collar of the outside all the way through and has crystals in the middle i have no clue what they are

 

[old digger]

Welcome! What county did you find it?
It's a fairly common to find this type of hematite or ironstone here in Mt. That is an interesting piece in that it is infused with a more erodable material.

 

[Mooggie]

This one was found just outside of Geraldine in Chouteau County.

 

[Brian T. Booth]

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=802137"/>

<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=802138"/>

This was found in central Montana in a farm field. Any thoughts on what it is?

This is A
a iron nodule. It could be a hematite or some other iron mineral(s) such as goethite or a iron carbonate nodule also known as ciderite nodule.

 

[Alex Burke]

It looks like it would look cool sliced and polished

 

[rock]

I vote the slice and polish. Probably be worth the time due to it being worth allot of money when its done.

 

[marinedad]

I can slice it and make some cabochons. looks interesting.

 

[pippinwhitepaws]

dino poo...

 

[Eu_citzen]

Brian nailed it yet again; has a resemblance of the ironstone found in koriot, Australia. Beautiful when cut and polished.