What is this heavy dark rock
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Thread: What is this heavy dark rock

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  1. #1
    us
    May 2010
    337
    177 times

    What is this heavy dark rock

    I had purchased a large box of petrified wood, geodes, and some small unusual rocks. This rock had caught my attention since it was very heavy for its size. A large magnet will not stick to it. I dangled a small magnet near it and it barely moves to the rock. There looks to be specs of iron or nickel all over it. I used a file on a small edge and it will not do much to it.
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  2. #2
    Charter Member
    us
    May 2010
    White Plains, New York
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    Not a meteorite. Looks like Petrified wood.
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  3. #3
    us
    May 2010
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    Petrified wood would not attract a magnet, correct?
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  4. #4
    Charter Member
    us
    May 2010
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    Quote Originally Posted by oldbattleaxe View Post
    Petrified wood would not attract a magnet, correct?
    " A large magnet will not stick to it. I dangled a small magnet near it and it barely moves to the rock."

    You can magnetize almost any rock enough to "barely" move a small magnet. Could be shale with some mica in it. It is terrestrial though.
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  5. #5
    us
    Jeremy

    Mar 2019
    Gilbert, Arizona
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    Prospecting
    Have you done a streak test? Scratch it vigorously on the unglazed side of a tile or you can even sometimes do it underneath your toilet seat. Does it leave any streak at all?

    Quote Originally Posted by oldbattleaxe View Post
    I had purchased a large box of petrified wood, geodes, and some small unusual rocks. This rock had caught my attention since it was very heavy for its size. A large magnet will not stick to it. I dangled a small magnet near it and it barely moves to the rock. There looks to be specs of iron or nickel all over it. I used a file on a small edge and it will not do much to it.
    A2coins likes this.
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  6. #6
    us
    May 2010
    337
    177 times
    Yes it makes a black line when I strape it on the lid underside.
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  7. #7
    us
    Jeremy

    Mar 2019
    Gilbert, Arizona
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    Prospecting
    If it left a black streak, itís most likely magnetite. In fact from the looks of it as well I think thereís a 99.9% chance it is. It dormant seem to be slag. Not a meteorite though.

    Quote Originally Posted by oldbattleaxe View Post
    Yes it makes a black line when I strape it on the lid underside.
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  8. #8
    us
    May 2010
    337
    177 times
    Quote Originally Posted by BloodMoon View Post
    If it left a black streak, itís most likely magnetite. In fact from the looks of it as well I think thereís a 99.9% chance it is. It dormant seem to be slag. Not a meteorite though.
    Thanks for all of the help forum. SOLVED
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  9. #9
    Charter Member
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    Tommy

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  10. #10
    us
    Jul 2011
    Gold canyon AZ
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    If you measure the angles of your specimen, you will see that it has a cubic structure, you can do this with any terrestrial rock if it has an angle resulting from a break.
    meteorites usually do not exhibit any geometric structure, so a specimen which exhibits nice angles is not a meteorite.
    but, as the disclaimer goes, there are some which came from Mars which could have such a structure since Mars formed similar to Earth. There seems to be an exception with everything, keep looking, they are out there.
    time for another drink

 

 

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