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308 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.

    - http://www.geology4today.com/meteorites-and-tektites.html

     

    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.

     

    Mike

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