New to forum...Trying to identify

maxmillius

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New to forum...Trying to identify

Submitted by maxmillius on Thu, 09/29/2011 - 02:45.

I am a novice to the field and trying to learn about meteorites.

Enjoy metal detecting in my free time.

Came across this rock with unusual matrix.

I have several pics on my server.

Rock is very soft, can break with a rock hammer, hardness of sandstone.

Appears like limestone with mix of small round spheres ranging in size from poppy seed size to buckshot size.

I believe the dark spheres are iron..they dissolve very quickly in hydrocloric acid.

Have never seen a rock with so many round type spheres inside.

http://www.winland.us/1.jpg

http://www.winland.us/2.jpg

http://www.winland.us/3.jpg

http://www.winland.us/4.jpg

http://www.winland.us/5.jpg

http://www.winland.us/6.jpg

http://www.winland.us/7.jpg

http://www.winland.us/8.jpg

http://www.winland.us/9.jpg

In my real life work with the State Library of Ohio as a Network Administrator...

A branch of the State library is called SEO library center where I work.

We provide a centralized database and software for 80 public libraries.

All libraries in the SEO consortium share resources across the state.

http://www.library.ohio.gov/SEO

appreciate any ideas as to the rock identification

don

Donald Winland

Gus Horsley

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Hi Don and welcome to

Thu, 09/29/2011 - 07:21

Hi Don and welcome to GR.

Your rock appears to be oolitic limestone. The hardness and the fact it dissolves in acid would support this. The rock is formed in tropical seas which are supersaturated in calcium and the oolites (the round granules) form around a nucleus by agitation of the water. Larger grains are known as pisolites and another example of a similar type are cave pearls.

maxmillius

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Gus you were correct

Fri, 09/30/2011 - 00:55

Gus: thanks for the info. It looks like you were exactly right. I appreciate the help.

Donald Winland

John

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I must admit that I've never

Sat, 10/01/2011 - 21:55

I must admit that I've never seen so much in the way of pyrite nodues except in the Trudos Mountains in Cyprus. It reminds me of one I saw there.

You say that the nodules disolved quickly in HcL, but the matrix should have fizzed pretty well. Did it?

John

“Civilisation exists by geological consent, subject to change without notice.” - Will Durant

John

“Civilisation exists by geological consent, subject to change without notice.” - Will Durant

GeologyRocks