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Thread: Black Agate?

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  1. #1

    May 2019
    Colorado
    3
    8 times
    Rocks and Minerals

    Black Agate?

    New to the site. Hoping to get some verification as to what I found. I believe these to be Agates (and one piece of red jasper). Some have slight banding and internal features that lead me to think agate. Some are translucent. Some have small geode like features that have a druzy look to them. Any help to pinpoint exactly (or close) to what they are would be appreciated. All of them were found at the same location in central Colorado. Please let me know if I can provide other information. Thanks,
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  2. #2
    Charter Member
    us
    papa

    Feb 2017
    Georgetown, SC
    Fisher F75
    3,277
    5997 times
    Metal Detecting
    Sure look like agate to me. Nice bunch of finds. Are you finding any with any color to them?


    "And so the population was gradually led into the demoralising temptations of arcades, baths, and sumptuous banquets. The unsuspecting Britons spoke of such novelties as 'civilisation', when in fact they were only a feature of their enslavement." Tacitus, Roman Senator and Historian, written AD 98.

  3. #3

    May 2019
    Colorado
    3
    8 times
    Rocks and Minerals
    No real color, just the Black, Gray and White look. Some of the more translucent pieces have a brown tint to them, almost looking like a smoky quartz. I have some the pictured collection in the tumbler now. Interested to see what they look like after 10 days of course grit.

    Thanks for the reply!
    Kray Gelder likes this.

  4. #4

    Jul 2018
    Wisconsin
    280
    385 times
    All Types Of Treasure Hunting
    Any chance of getting some close up images? kinda look like flint/chert with some chalcedony.
    Toecutter likes this.

  5. #5

    May 2019
    Colorado
    3
    8 times
    Rocks and Minerals
    Here are a few up close photos, shown dry/wet in order. Hope that helps.

    Thanks for the advice/opinions.

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    Kray Gelder, T.C. and fuss like this.

  6. #6

    Jul 2018
    Wisconsin
    280
    385 times
    All Types Of Treasure Hunting
    they are some kind of chalcedony/chert combo with some liesegang banding is my thought on them. Interesting. looking forward to seeing them when done in your tumbler.
    stdenis_jd likes this.

  7. #7
    us
    Mar 2019
    Las Vegas, NV
    13
    17 times
    Prospecting
    It's not agate. Agate has very fine banding from the slow deposition of siicon dioxide as a replacement in nodules in limestone. I dont even think it is quartz / chalcedony in origin. Almost looks like dolostone (Magnesium rich limestone). Pour a little muratic acid (HCL) and see if the acid reacts with it. Quartz won't have much of a reaction with acid but if it is limestone in origin it will react rapidly with acid.

 

 

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