NHrockhunter Posted September 26, 2017 Share Posted September 26, 2017 Can anyone identify what this rock might be? Quote Link to comment Share on other sites More sharing options...
4meter Posted September 27, 2017 Share Posted September 27, 2017 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? Quote Link to comment Share on other sites More sharing options...
NHrockhunter Posted October 18, 2017 Author Share Posted October 18, 2017 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? Quote Link to comment Share on other sites More sharing options...
4meter Posted October 19, 2017 Share Posted October 19, 2017 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. 1 Quote Link to comment Share on other sites More sharing options...
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