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Jake7291

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I'm going to post this boulder on this sub forum for now until I know for sure what it is.

This was pulled out of my field years ago by my grandparents.  It sat in a rock garden for years until this summer when I remade it.   This was originally covered with mud from sitting so long, it was nearly buried until I dug it out.  I cleaned it up after realizing it has a melted crust.   

This stone has its own pole when I take a compass to it.  It leaves no streak with a sample I took off.  Weighs about 130 pounds. Specific gravity of shell/crust sample is 2.77-3, adjusted for slight errors. 

The shell is very smooth in parts, and is fragile.  Any idea on what this mass is?  

 

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Looks like a large piece of "Unakite" the common name used for a pink (Feldspar) & green (Epidote) granite found in the southeastern mountains.  This piece appears to contain a fair bit of Magnetite and the photos seem to show a dark "glassy" mineral on the surface  I suspect is smoky quartz.  A very interesting rock to look at.  Here is a link to the wiki page for Unakite

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33 minutes ago, 4meter said:

Looks like a large piece of "Unakite" the common name used for a pink (Feldspar) & green (Epidote) granite found in the southeastern mountains.  This piece appears to contain a fair bit of Magnetite and the photos seem to show a dark "glassy" mineral on the surface  I suspect is smoky quartz.  A very interesting rock to look at.  Here is a link to the wiki page for Unakite

Just curious, but where do you see pink or green in this stone? This stone is brown and black.

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Your color photos clearly show shades of  green, pink (your brown?) and black.  The colors might be more apparent to the eye when the sample is wet and/or polished.

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1 hour ago, 4meter said:

Your color photos clearly show shades of  green, pink (your brown?) and black.  The colors might be more apparent to the eye when the sample is wet and/or polished.

I don’t see anything that even resembles unakite. I see the same colors the OP has described. Looks like an oxide crust that has been chipped away in places to reveal a black/dark grey interior. 
 

I have no idea what it is at this point, but I think it’s safe to say it’s terrestrial in origin.

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7 minutes ago, d_day said:

I don’t see anything that even resembles unakite. I see the same colors the OP has described. Looks like an oxide crust that has been chipped away in places to reveal a black/dark grey interior. 
 

I have no idea what it is at this point, but I think it’s safe to say it’s terrestrial in origin.

Thank you, for a second I thought I was going color blind.  This stone is cleaned, I scrubbed the dirt off with tooth brush and vinegar. Then cleaned it with soap and warm water right after.

The shell is melted at  a majority of half the stone, very smooth with a few divots.  The shell is barely as thick as my fingernail.  The other side has the shell still, but it's too damaged by years of being in a field that is plowed annually.  

I originally thought the black was magnetite as well, but the streak test of a sample leaves nothing behind. 

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