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Peat Burns

Rock Identification

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Peat Burns

@ynot et al.  How would you characterize this rock?  It's about 2 lbs and has dimensions of 4-1/8" x 2-1/2" x 3".  Heavy, but does not attract to magnet.  I am calling it an "iron-rich concretion".  From glacial deposits in Michigan. Thoughts?

 

20180205_112000.thumb.png.b322d990cb94d13e157411d6ddde3bc3.png

 

 

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Peat Burns

20180205_111935.thumb.png.bea237a08eddd9d4ea55d4c35cf68227.png

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ynot

Looks like an iron concretion to Me.

(To all of Us.)

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Peat Burns
5 minutes ago, ynot said:

Looks like an iron concretion to Me.

(To all of Us.)

ok.  thanks

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Tidgy's Dad

Yup, iron concretion.

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Peat Burns
1 minute ago, Tidgy's Dad said:

Yup, iron concretion.

Thank you, TD.

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abyssunder

I would call it ironstone or stony-iron.
Can you determine if the white material is silicate or not?

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Peat Burns
3 minutes ago, abyssunder said:

I would call it ironstone or stony-iron.
Can you determine if the white material is silicate or not?

Thanks, abyssunder.  Unfortunately, I have not held the specimen in hand.  The pics were emailed to me for ID.  The gentleman thinks it's a planetary meteorite.  I knew right away it was not. I hate to be the bearer of bad news to him.  But more often than not, I have to tell people that what they have is not a meteorite, fossil egg, dinosaur bone, mammoth bone, etc., etc.  :(.  Hate that.  They are so disappointed...

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abyssunder

That was the reason why I asked for the silicate sometimes present in some type of meteorites, but I think the specimen is not one of them, because it has vesicles not characteristic to meteorites with high iron content.
A few weeks ago I've seen on the sale sites of the internet a very similar specimen, unfortunately I haven't made a copy of that picture and I can't find it anymore. Seller listed as a warn iron concretion (maybe from glacial deposit), I can't remember correctly.

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Plax

Every rock with an orange rind is not an ironstone concretion. Sometimes the interior is not iron at all. Same with black "phosphatic" concretions. They have black on the outside but may be any number of minerals or fossil on the interior. This one is probably iron through and through but wanted to point this distinction out.

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