[meteorite-list] Rocks from Space Picture of Day - December 22, 2010

[Count Deiro]

Thanks Pat and Jason,

So, from what I gather from your posts and the photo, the silicates melt out before the iron under the heat and pressure of entry.... and they probably weather out more quickly on the ground. Cool!  

Happy Holidays,

Guido 


-----Original Message-----
>From: Jason Utas <meteoritekid at gmail.com>
>Sent: Dec 21, 2010 10:47 PM
>To: Count Deiro <countdeiro at earthlink.net>, Meteorite-list <meteorite-list at meteoritecentral.com>
>Subject: Re: [meteorite-list] Rocks from Space Picture of Day - December 22, 2010
>
>Hello Count,
>Mundrabilla looks like so when cut:
>
>http://upload.wikimedia.org/wikipedia/commons/6/65/Mundrabilla_meteorite_NMNH_slice.jpg
>
>It's a coral-like intergrowth of Fe-Ni and troilite.
>They would probably have looked spectacular when found, but sadly
>their current surface morphology is due to the fact that troilite
>weathers more quickly than iron.  The inclusions weather away or
>weather out of the iron framework leaving a spongelike structure
>behind.
>There are two similar meteorites; Waterville and Buffalo Gap are in
>the same IAB grouplet, and all three have high concentrations of
>troilite.  There are also a few others like Georgetown that are
>structurally similar, but I believe chemically unrelated.
>Regards,
>Jason
>
>
>
>On Tue, Dec 21, 2010 at 10:37 PM, Count Deiro <countdeiro at earthlink.net> wrote:
>> Hi Mike and List,
>>
>> Thanks for putting the Mundrabilla example up for tonight's show. Super shot. Great meteorite.
>>
>> I notice that the exterior of this iron has hundreds of closely spaced similar sized vug like holes. Is this an entry artifact, or maybe terrestial weathering? Would someone care to explain the holes?
>>
>> Guido
>>
>>
>>
>>
>> -----Original Message-----
>>>From: Michael Johnson <michael at rocksfromspace.org>
>>>Sent: Dec 21, 2010 9:47 PM
>>>To: meteorite-list at meteoritecentral.com
>>>Subject: [meteorite-list] Rocks from Space Picture of Day - December 22, 2010
>>>
>>>http://www.rocksfromspace.org/December_22_2010.html
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