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At the end of my knowledge - Could use some help

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#1 Node

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Posted 22 July 2020 - 10:33 AM

First, let me say thanks for taking the time to read this and I hope I have done my due diligence to avoid any obvious attributes which would just waste you time.

 

I do have a rock that I need help with and here is what's been done up to this point.

 

Story - Found the rock in my personally created rock garden/landscaping.  I built my home in 2000 in a new neighborhood.  We bought a small lot that butts up to a wood and farmer's field which to my delight are still the same today.  I had to clear the trees and after the ground excavation, I found I had bought a lot with a plethora of rocks.  I assumed the farmer rolled or moved field rocks onto the area that I would one day be the site of my home.  I took these rocks and made two retaining walls and lots of landscape border.  The smaller rocks where added to a rock garden on the back side of my deck.

 

In May of this year I was introduced the world of Meteorites (long story for another day) and I procured a metal detector and started testing all the rocks on my property.  What I found was a lot of crap and old square nails; however, In the rock garden, I found one rock that stood out due to the what looked like black crust.  I figured it was a native rock (Southern WI) and posted a request for identification at a geological forum.  I got some good advice but I was not able to classify the rock.  I cut off one end of the rock and was surprised to find a blue\green inside.  That started a closer look the rock and I began recording it's properties which have lead me here.

 

Rock Properties:

428 Grams

Density 3.058

Mild attraction to a magnet

Streak test - White or limited color when streaking

Has surface depressions from what looks to be material that more easily weather away.  Looks a bit like acne scars.

I not sure how else to describe it so to the pics!

 

Rock surface Pics:

 

Rock-03.jpg

 

 

 

 

Cut face:

 

 

 

Cut face small - Looks to be larger circles that make up this material

 

Remote-Perspective.png

 

Cut face reflections - Took a pic of the cut face reflecting the sun:

 

Reflection-Zoom.png

 

10x Mag of interior pics

 

Clean-Cut-Close-01.jpg

 

Clean-Cut-Close-05.jpg

 

Clean-Cut-Close-03.jpg

 

Clean-Cut-Close-01.jpg

 

 

10 Mag exterior pics:

 

Surface-Close-04.jpg

 

Surface-Close-03.jpg

 

Surface-Close-01.jpg

 

Thanks again for your time,

 

Ken...



#2 Supernova74

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Posted 22 July 2020 - 11:01 AM

I’m no expert however looks more earth like to me and perhaps to round looks like a pebble you see washed up on the beach could have traces of iron or pyrite 



#3 lee14

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Posted 22 July 2020 - 01:59 PM

Not a meteorite. You've done well with the pics, but the most revealing ones show stratification, and that rules out anything but a terrestrial specimen. 

 

Lee


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#4 Node

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Posted 22 July 2020 - 03:15 PM

Can you be more specific as to where you see evidence of layering?



#5 Supernova74

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Posted 22 July 2020 - 03:25 PM

it’s just to organic looking to be a meteorite.and never round in shape or oval if you have a look online you know what I mean.from the outside looks like flint of some kind inside the stone itself a mixture of mineral deposits.quartz,iron maybe pyrite possible mica.looking at the purple-ish looks volcanic of earth origin.


Edited by Supernova74, 22 July 2020 - 03:29 PM.


#6 Node

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Posted 22 July 2020 - 03:38 PM

 I understand it does not look like a common meteorite, what I am looking for evidence for a specific origin one way or another. 



#7 Node

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Posted 22 July 2020 - 03:47 PM

Adding a better look at the cut face:

 

Dry

 

Clean-Cut-Crop.jpg

 

Wet

 

Clean-Cut-Wet-01-Crop.jpg



#8 Supernova74

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Posted 22 July 2020 - 04:17 PM

unfortunately this is mainly an Amateur Astronomy site maybe you could find a geologist of some description in a local museum for more accurate answers sorry cannot be of any further assistance message me if come up with any answers 

sean



#9 lee14

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Posted 22 July 2020 - 04:18 PM

Can you be more specific as to where you see evidence of layering?

The horizontal lines that are evident in the most recent close-ups that you just posted.

 

Lee


Edited by lee14, 23 July 2020 - 08:34 AM.

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#10 mark8888

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Posted 22 July 2020 - 09:58 PM

it’s just to organic looking to be a meteorite.and never round in shape or oval if you have a look online you know what I mean.from the outside looks like flint of some kind inside the stone itself a mixture of mineral deposits.quartz,iron maybe pyrite possible mica.looking at the purple-ish looks volcanic of earth origin.

I agree that it doesn't look like a meteorite. But the shape is plausible. For example lots of Gao Guenie have a similar shape.

https://www.andrewjo...est-_F914AC987C


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#11 Glassthrower

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Posted 23 July 2020 - 07:52 AM

Hi Ken,

 

Not a meteorite. Shape, texture, and matrix don't look right for a meteorite.

 

Also, unless you live in a known strewnfield or there was a recent known fall, you will never find a meteorite in your yard.

 

I use this handy flowchart when considering rocks I have found :

 

meteor-find.jpg


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#12 Xyrus

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Posted 26 July 2020 - 05:32 PM

Based on your description of magnetism, the density, the color, and the structure of the rock this could be a form or peridotite (with other minerals thrown in).




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