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Help with rock ID

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  • Help with rock ID

    Just needing some help on identifying this rock I found in Vermont.
    I am assuming part of it is quartz but can’t figure out the black coating crust.
    (I 100% know this is not an artifact just need help in ID of rock material)

  • #2
    what part of Vermont? Those bubble like objects in the outer layer are cool.
    TN formerly CT Visit our store


    • Ljjp
      Ljjp commented
      Editing a comment
      Western southern Rutland County

  • #3
    botryoidal psilomelane occurs in Vermont you can read more about it in chapter one of this PDF CHAPTER I. SOURCES OF MANGANESE read just under the word " oxides" Please note I am not a geologist but am just trying to help. Someone may be along and help further.
    TN formerly CT Visit our store


    • #4
      Hoss hit the magic word- botryoidal

      It looks like botryoidal hematite, but it could be something else I guess.
      Hong Kong, but from Indiana/Florida


      • #5
        I think Clovis has it. I've seen that formation here in Pa. Kim
        Knowledge is about how and where to learn more Knowledge that you seek. Snyder County Pa.


        • #6
          Wow! You guys are amazing! Thank you for your help! My kiddos and I are making a rock collection and this one had us stumped


          • #7
            I went with psilomelane because manganese is black and grey whereas iron is usually earthy with dark brown being the color for hematite to reds and even yellows in limonite. Its a cool specimen . Glad we could help you.
            TN formerly CT Visit our store