Last Post 14 Aug 2016 07:40 PM by  Michael Wheeler
Unidentified Rock
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Martin Sohlberg
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16 Jun 2016 11:04 AM

    We have been finding this rock in the desert, often where we are finding gold.  The rock, as you can see, (the sliced version) is very dense, weighs a great deal and is non-magnetic.  The glassy looking crystals (for the lack of a better term) appear bluish in sunlight and silvery otherwise.  We have asked a couple rock hounds but noone has come up with a definitive answer.

    Brad Lamb
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    16 Jun 2016 11:25 AM
    ?Obsidian?

    ob·sid·i·an
    əbˈsidēən,äb-/Submit
    noun
    a hard, dark, glasslike volcanic rock formed by the rapid solidification of lava without crystallization.
    Leo Lorenz
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    16 Jun 2016 10:24 PM
    Sure looks like Obsidean too. What state do you find it in? I been getting great bunch's of it in Nevada
    Martin Sohlberg
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    17 Jun 2016 05:37 AM
    I have seen obsidean, but I don't think this rock is that. Obsidean is brittle and when struck breaks off in shards. This rock is very hard and when struck hard will break along fractures. I may be misleading you both with the glassy thing. It's more like something crystaline that reflects light and there are just a spattering of them in the rocks. It weighs like lead, but dosen't melt at low temperatures.
    Benjamin Crain
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    17 Jun 2016 07:28 AM
    The second picture is identical to a Siberian Tektite I have, is this area near a impact site?
    Martin Sohlberg
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    17 Jun 2016 07:55 AM
    I don't know, Benjamin. I have not heard of any impact sites near there, but have limited knowledge.
    Martin Sohlberg
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    17 Jun 2016 07:58 AM
    BTW, I did a google search for Siberian Tektite and only find Tibetan Tektite and that really does look like what we find.
    Mary McCarty
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    17 Jun 2016 03:03 PM
    Been driving lately in a lot of volcanic areas. Could it be black basalt? It tends to have a bit of a gleam to it.
    Obsidian presents with conchoidal fractures. This rock does not appear to do that.
    Martin Sohlberg
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    17 Jun 2016 03:49 PM
    While I am far from an expert, my experience with lava was that it was rather porous and light while this rock is very dense and heavy. We are finding it where we find gold to give you an idea of its weight. The area we found a quantity of this type oof rock was in the Pinto Mountains east of Twentynine Palms and south of Twentynine Palms Highway.
    Kenneth Swineford
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    20 Jun 2016 09:05 PM
    Judging from the glassy smooth exterior and the metallic appearing interior, I'd say you have yourself a meteorite.
    Benjamin Crain
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    21 Jun 2016 06:10 PM
    The tektite I have was found on the top of the ice by a scientist, it is very different then the occasional Nickel-Iron meteorites I find. They are extremely heavy and dense, usually have pitting from being turned molten, and sometimes have a glass to them.

    The tektites are more of a combination of carbon and sand. They are much lighter, they will have glass like outer coatings and some pitting, but will be quite light weight for their size. Look how far you are away from Meteor Crater National Park in Arizona, some of the largest meteors ever recovered come out of that region. It is very feasible it is a remnant from that blast, or even another all together separate airburst.
    Martin Sohlberg
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    01 Jul 2016 06:14 AM
    The rock has been identified! We found a way to measure specific gravity and checked the rocks. The multiple rocks that we had found all fell into a S.P. of 4.8 - 5.3. That lead us to hematite. We did a scratch test on porcelain and found that the resulting smudge was reddish brown, not black like we had expected. Finally we sent a couple specimens to California State University Geology Department where the rock was identified as a class of hematite, called specularlite

    Thanks for all the input and happy hunting!
    Michael Wheeler
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    14 Aug 2016 07:40 PM
    Is the entire rock black or is attached/part of another rock. We find Tourmaline attached to quartz in certain areas where we find gold.
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