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507 Views 2 Replies Last post: Dec 17, 2014 10:27 AM by Snowball Solar System RSS
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Jul 12, 2014 1:13 AM

Is this a meteorite I have found ?

I think I have found a large iron meteorite.  It weighs 74 pounds.  It is extremely dense and magnetic.  It has regmaglypts.  I found it in ottawa.

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    Jul 12, 2014 6:00 AM (in response to Meteor man)
    Re: Is this a meteorite I have found ?

    You obviously know a bit about meteorites.


    There are many sites that explain what to look for by way of macro features that may identify them, eg.



    But there are several things that are not right for meteorite:

    - it contains holes

    - it has no fusion crust (these are much smoother than what you might be imagining)

    - the 'regmaglypts'  texture has lumps protruding (it should be ridges that protrude, as in this example)

    - the overall shape is too far from equant (such a shape would break into more equant shapes in the atmosphere)


    We could consider the density if you like, but I suspect it won't help much in this case, since we already know it is magnetic and it does not look like magnetite (iron has a similar density to metallic meteorites).

    But if you want to check it: Because of its size, it would be difficult to measure the volume, so I'd suggest knocking a small corner off, weighing it, then using the water immersion method to determine its volume.


    So if not a meteorite, what is it?

    I am sure it was molten at one stage, but it does not look volcanic (though one would want to get a thin section under the microscope to make sure).

    It looks industrial, to me at any rate; without lab analysis to be sure, these things are always subject to opinion. My guess would be that it is metal slag spilled in a foundry or smelter. I envisage the 'regmaglypts' being an impression of the substrate on which the liquid fell, and the smoother other side being exposed to the air hence levelled-out before it solidified (also allowing some bubbles to come to the surface). There are hints of layering, so it could have built-up in several spillage episodes.



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  • Currently Being Moderated
    Dec 17, 2014 10:27 AM (in response to Meteor man)
    Re: Is this a meteorite I have found ?
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