What is this rock
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Thread: What is this rock

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  1. #1

    Aug 2019
    2
    1 times
    All Types Of Treasure Hunting

    What is this rock

    Images: https://imgur.com/a/sKxzuhK

    Basic tests so far/ observations

    Small black crystals are seen on the surface of the stone
    Is partly magnetic. Holds a magnet to the surface.
    Scraped the white/pinkish crystals to get a powder, and used vinegar to test for calcium. Tested side by side with seashell. My rock does not contain calcium carbonate/ limestone.
    Sample weighs exactly 20 oz displaces 210ml of water.


    Question:

    Small black crystals are seen on the surface of the stone

    I don't think this could be a meteorite, because of the large crystals on the surface of the stone.
    Am i correct in my reasoning?
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  2. #2

    Aug 2019
    2
    1 times
    All Types Of Treasure Hunting

    What is this rock?

    Found while hiking in Gloucester Massachusetts

    Rock is about the size of a human fist.
    Weighs 20oz exactly
    Displaces 200ml of water
    Is magnetic( Holds magnet somewhat)
    Scraped the white/pinkish crystals(square) and tested for calcium carbonate. No fizzle so not calcium
    Small and large black dots are seen throughout the rock( Picture 2 middle) (Picture 1 bottom right)


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    My understanding is that a rock can only develop crystals like this during slow cooling while inside of the earth.It looks like the sample underwent some sort of melting. So it must not be a meteorite right?

    PS: I don't understand why my post is called Test i would change it if i could
    Last edited by Larrysands; Aug 18, 2019 at 11:01 PM.
    ToddsPoint likes this.

  3. #3
    us
    Dec 2012
    Concrete, WA
    Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
    3,737
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    Prospecting
    I would agree that it's not a meteorite..looks more like an encrusted
    conglomeration of different materials.

    Beyond that, I got nuthin'..wish I could be more helpful.
    Mike (aka Dizz)

    "If you love wealth better than liberty, the tranquillity of servitude better than the animating contest
    of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick
    the hands which feed you. May your chains set lightly upon you, and may posterity forget that you
    were our countrymen." ~~ Samuel Adams, 1776

    Dizzy's Super-Simple, Universal Rule of Forum Conduct: Don't be an ass.

  4. #4
    us
    Mar 2018
    Todds Point, IL
    2,429
    4409 times
    Metal Detecting
    Google porphyry and you will see many examples similar to yours. Gary

  5. #5
    us
    "Is that a Geiger Counter?"

    Feb 2006
    South Central Upstate NY in the foothills of the headlands
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    11,636
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    Metal Detecting
    Crystals can form in various situations. Salt is a crystalline matrix. Crystals can also be ground down and formed in conglomerates and sedimentary rocks (silica sandstone is silica crystals reformed).

    My guess is that you have a chunk of iron-cemented sandstone. (Iron-oxide and silica).
    America was founded by tough hell-raisers. Rugged citizens who evaded taxes, spoke strongly against tyranny, grew tobacco, brewed beer, distilled spirits, and smuggled weapons. And it will be saved by those same types of citizens.

 

 

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