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Odd rock help?


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Need more input.  Hardness?  streak? Does it fizz if you put warm vinegar on it?  does a magnet stick to it? where was it found?

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  • 3 weeks later...
On 9/27/2017 at 12:23 PM, 4meter said:

Need more input.  Hardness?  streak? Does it fizz if you put warm vinegar on it?  does a magnet stick to it? where was it found?

Scratches a mirror, no mark on raw ceramic, no fizz on vinegar test, magnet is drawn to it. It was found in central New Hampshire.

I've spent a lot of time trying to identify this rock...

PLEASE CAN anyone tell me what rock/mineral has this pattern?

 

 

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Thank you NHrockhunter for the additional info.  This is a hard nut to crack.  Based on the photos and quick check on the geology of central NH, I think you have a heavily weathered piece of ultramafic dike rock.  It fits the description in having a glassy matrix with small "needle" like crystals embedded in the matrix with mini/micro magnetite crystals.  For a more exact ID, it would require either finding a geologist that is very familiar with the rocks of the area were this sample came from or giving it to a University willing to do a thin section analysis for you.  If you get more info on the sample, please let us know.  I would love to know exactly what it is.

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