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  1. #1

    May 2012
    Montevallo, Alabama
    Metal Detecting

    Blue and gray rocks.

    I found these rocks at a park in Briarfield Alabama. Can any one tell me what they are?
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  2. #2
    Jan 2011
    Whites MXT, E Trac, Garrett Pro Pinpointer
    451 times
    All Types Of Treasure Hunting
    not sure about either but, that being said the one on the right looks like either obsidion or a fine grained quartz, maybe......

    If ever a time should come, when vain and aspiring men shall possess the highest seats in Government, our country will stand in need of its experienced patriots to prevent its ruin."
    -Samuel Adams-

  3. #3

    Mar 2006
    27 times
    Both are slag, which is a by-product from the production of iron. I'm guessing there are probably some old iron furnaces near the area where they were found. The color of the slag varies, but most slag is blue, green, or purple, with a glassy appearance. If you look closely, you should be able to see tiny air bubbles in the rock, produced by rapid cooling. Slag is worthless, but awfully pretty....I have a few boxes of slag I collected here in PA, someday I'd like to try to make jewelry out of it.

  4. #4
    too many hobbies...

    Jul 2009
    Battle Creek, Mi
    Mine lab, Garrett, Bounty Hunter,
    102 times
    The one on the left almost has an turquoise look, they could be glass slag not iron...



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