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  • What type of material

    Hi all. I recently found this chunk of black material. Not something I'm used to seeing around here.



    New York

  • #2
    Uh-o Kaz, no pics came thru! I’m studying black minerals now, so hurry up and re-post! Need more lessons....
    Digging in GA, ‘bout a mile from the Savannah River

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    • #3
      Hi Cecilia I can see the pics but I will try again

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      New York

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      • #4
        Maybe just black flint, a little water worn. What part of NY are you in?
        New Jersey

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        • Kaz
          Kaz commented
          Editing a comment
          I am on Long Island. I was figuring it was flint. Just a really rare thing to find around here. Thanks

      • #5
        If the color is true, and it's chert, it's a large flake of Normanskill chert. But it also somewhat looks like slag glass.
        http://www.ravensrelics.com/

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        • #6
          Looks like dacite to me. Is that possible in Long Island?
          California

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          • #7
            The 2nd picture shows a bulb of percussion which wouldn't be slag but the other 2 pictures look like slag.
            NW Georgia

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            • pkfrey
              pkfrey commented
              Editing a comment
              Normanskill outcrops in the Hudson Valley, not to far removed from Long Island. You can see a bulb of percussion and conchoidal fracturing on slag if a chunk is hit by the plow, or banged against another rock by erosion. The smoothness along those outer ridge lines really makes this look like slag. The piece has a translucent look to it, like opaque glass. But IDK from the photo.
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