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Thread: What are these shiny black rocks?

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  1. #1
    us
    DIG up EVERYTHING!!

    Apr 2007
    Southern Indiana
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    What are these shiny black rocks?

    Last week we went to the Cave in Rock, IL area and was digging around in an old fluorspar mine....and found these. These are the only ones like this I have ever found there. Very shiny, glassy black rocks. Please let me know what I have here. Thanks!!
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    HH to all, and to all a GH!!!

  2. #2
    Charter Member
    um
    Jul 2004
    Broward Co.
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    Re: What are these shiny black rocks?

    Obsidian
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    In the land of the blind, the one eyed man is King.

    You can lead a horse to water but you can't make him drink it.

  3. #3
    us
    Jun 2007
    Raleigh, NC
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    Re: What are these shiny black rocks?

    Looks a little like Anthracite coal. http://www.google.com/imgres?imgurl=...ed=0CBwQ9QEwBQ

  4. #4
    se
    Sep 2006
    Sweden
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    Re: What are these shiny black rocks?

    Obsidian or possibly slag can be similar in appearance.
    rock likes this.
    Geologists are gneiss, tuff, and a little wacke.

  5. #5
    us
    DIG up EVERYTHING!!

    Apr 2007
    Southern Indiana
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    Re: What are these shiny black rocks?

    now I am really confused....it looks just like the obsidian....as well as the anthracit coal.
    HH to all, and to all a GH!!!

  6. #6
    us
    DFCA

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    Re: What are these shiny black rocks?

    put a match to it, if it starts to melt it's coal

  7. #7
    us
    DIG up EVERYTHING!!

    Apr 2007
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    Re: What are these shiny black rocks?

    ok....held a lighter to it for a good bit....no melting whatsoever.....also....it seems too heavy to be coal, in fact it is quite heavy for the size....I havent weighed it and compared the weight to a rock of the same size....but it does seem heavier.
    HH to all, and to all a GH!!!

  8. #8
    us
    DFCA

    Dec 2006
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    Re: What are these shiny black rocks?

    see if you can take and chip a piece off it, if it fractures easy but has a sharp edge it could be obsidian
    check this out
    http://en.wikipedia.org/wiki/Obsidian

  9. #9
    us
    Sep 2006
    Washington and Oregon
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    Re: What are these shiny black rocks?

    That is obsidian..If it did not melt or burn I would bet my eye teeth one it.
    ~Nash~
    Whatever it is, it is valuable. If nothing else for the lesson learned or simply the experience of having been there.

  10. #10

    Oct 2007
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    Re: What are these shiny black rocks?

    It looks like old slag glass.....kind of weathered.....there are a lot of air bubbles trapped in the glass.....I have a smelter and I am willing to bet it is old slag.....the bubbles in obsidian would appear more consistent in size ......not sporadic sized bubbles as seen in the photo....
    here is a photo of my slag glass....sorry don't have more of a close up...

    db
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    rock likes this.

  11. #11
    us
    DIG up EVERYTHING!!

    Apr 2007
    Southern Indiana
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    Re: What are these shiny black rocks?

    I didn't buy these....I picked them up while digging around in an old abandoned rock quarry.
    HH to all, and to all a GH!!!

  12. #12
    us
    Tuberale

    May 2010
    Portland, Oregon
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    Re: What are these shiny black rocks?

    May I offer an alternative? May still be glass, though. Just not obsidian in the classic sense.

    A meteorite which strikes the Earth produces ejecta from the impact site, which can melt from the pressure of the impact, but solidify while still in the air. Usually dark, glossy black, similar to obsidian. Called tektites. Try searching for images on google for tektites.

  13. #13
    se
    Sep 2006
    Sweden
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    Re: What are these shiny black rocks?

    Quote Originally Posted by Tuberale
    May I offer an alternative? May still be glass, though. Just not obsidian in the classic sense.

    A meteorite which strikes the Earth produces ejecta from the impact site, which can melt from the pressure of the impact, but solidify while still in the air. Usually dark, glossy black, similar to obsidian. Called tektites. Try searching for images on google for tektites.
    I am doubtful if he found it in a old rock quarry??
    Geologists are gneiss, tuff, and a little wacke.

  14. #14
    us
    Sep 2010
    Cache County, Utah
    106

    Re: What are these shiny black rocks?

    Not a tektite.

    Tektites are either a rocky or a crystal, the rocky are similar in appearance to lava rock, moldavites are a green color and are only found in one place in the world (recognized place that is). Moldavites have reportedly been found in other areas but have been found to be a desert glass or other substances (fakes).
    Don't hate me because I am beautiful, there are so many better reasons.

  15. #15
    us
    Tuberale

    May 2010
    Portland, Oregon
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    Re: What are these shiny black rocks?

    Disagree, uthunter.

    Tektites are known from several locales around the world. One famous spot is in Australia, but currently illegal to remove anything associated with meteorite strike (meteorite, tektite, etc) from Australia.

    However, it was not always that way...

    When meteorite/comet struck where silicon dioxide (quartz) was common, ejecta very possibly small pieces of black tektite.

    Just as meteorites are not more common in one place or another on earth, tektites similarly can be found many places. This should not be surprising. It has been estimated that every square mile on earth receives a meteorite impact of up to a pound every 10,000 years or so. Erosion being what it is, eventually these pieces of impact-molten glass erode out of the soil and are concentrated in waterways.

 

 
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