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Thread: conglomarate of rock

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  1. #1
    gb
    Mr

    Jul 2013
    Scotland
    42
    33 times
    All Types Of Treasure Hunting

    conglomarate of rock

    Click image for larger version. 

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ID:	1610812Here is a rock I found in a river, I believe it is a conglomarate of iron crystals and other minerals, has anyone seen a rock like this and I would be very interested to find out how it was formed, thankyou.

  2. #2

    Aug 2017
    SW MO
    Garrett AT PRO
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    Metal Detecting
    That is very interesting, I've seen a lot of rocks and I have no idea.

    Looks like slag or some kind of igneous rock that cooled before all the rocks it intruded into melted. I'm just throwing out wild guesses.
    A2coins and mclean like this.

  3. #3
    Charter Member
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    papa

    Feb 2017
    Georgetown, SC
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    Metal Detecting
    If it's iron it would attract a magnet. The cubic crystal forms suggest pyrite or galena crystals. The color of the cubes may indicate oxidized galena in sandstone or mudstone. IMHO.
    bologna321, A2coins and mclean like this.


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  4. #4
    Charter Member
    us
    Oct 2014
    Massachusetts
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    Very interesting rock find!
    mclean and A2coins like this.

  5. #5
    Charter Member
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    Tommy

    Dec 2015
    Ann Arbor
    AT PRO Nel Attack Coil
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    looks really. cool
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  6. #6
    us
    Max

    Aug 2016
    Upstate, NY
    364
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    Banner Finds (2)
    Definitely pyrite (iron sulfide) crystals in a slate matrix. Here's a sample freshly broken from the host rock:

    Click image for larger version. 

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    Your sample is particularly cool though as that's the first I've seen as a river rock. The water action wore away the slate faster than the pyrite leaving distinct crystals with just a little edge smoothing. That's a great display piece you found!
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  7. #7
    Charter Member
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    papa

    Feb 2017
    Georgetown, SC
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    Metal Detecting
    Quote Originally Posted by paleomaxx View Post
    Definitely pyrite (iron sulfide) crystals in a slate matrix. Here's a sample freshly broken from the host rock:

    Click image for larger version. 

Name:	Slate.jpg 
Views:	26 
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ID:	1610888

    Your sample is particularly cool though as that's the first I've seen as a river rock. The water action wore away the slate faster than the pyrite leaving distinct crystals with just a little edge smoothing. That's a great display piece you found!
    Defintely? Wow. The example you post does not resemble the OP's.
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  8. #8
    us
    Mar 2008
    Boise, Idaho
    DFX, Tesoro Tiger Shark, Killer B Hornets, Stealth 720i scoop
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    All Types Of Treasure Hunting
    Agree, mudstone.
    Quote Originally Posted by Kray Gelder View Post
    If it's iron it would attract a magnet. The cubic crystal forms suggest pyrite or galena crystals. The color of the cubes may indicate oxidized galena in sandstone or mudstone. IMHO.

 

 

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