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

[Jason Utas]

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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