Black Rock ID
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  1. #1

    Oct 2019
    13 times
    All Types Of Treasure Hunting

    Black Rock ID

    This pebble looks like it was hydraulically smoothed. It is very dark gray or black on the side that was exposed. It is 3.5 inches long, 1.5 inches at the widest part and weighs 5 ounces. It can be scratched easily with a nail file. The underside (that was in the ground when found) looks slightly lighter in color (medium gray). Cannot determine if it would be considered granular or not - if so, it it very fine-grained. Looking for possible ID. Thank you.

    Click image for larger version. 

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ID:	1767981Click image for larger version. 

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Size:	154.1 KB 
ID:	1767982

  2. #2

    Jul 2018
    699 times
    All Types Of Treasure Hunting
    What color is the streak if any? check to see if it attracts a magnet as well. Looks like basalt from the images.

  3. #3

    Feb 2006
    1772 times
    River worn basalt.

  4. #4

    Oct 2019
    13 times
    All Types Of Treasure Hunting
    I don't have a streak tester. It is not magnetic.

  5. #5

    May 2010
    Portland, Oregon
    White's Coinmaster Pro
    3427 times
    Test for streak on the underside of a toilet lid. Tell us what the streak color is.

  6. #6

    Oct 2019
    13 times
    All Types Of Treasure Hunting
    Do you mean toilet lid or bowl? My lid is plastic.



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