[meteorite-list] Northbranch H5

From: Matt Morgan <mmorgan_at_meteoritecentral.com>
Date: Sun, 14 Jan 2007 15:47:39 -0700
Message-ID: <45AAB30B.2020603_at_mhmeteorites.com>

On the specimens I have/had, the Fe-Ox "wind" or "snake" through the
piece. I never saw one actual Fe-Ni vein in any piece of Northbranch. I
am not saying there are none, but yours look like Fe-Ox. The Fe in the
meteorite has oxidized to form hematite, so the hematite is not
primary. Shock veins are typically straight to curvilinear; look at
Etter TX. It has the best Fe shock veins I have ever seen...or does
Portales Valley? :)
Have fun looking, cool stuff!
Matt

Gary K. Foote wrote:

>Hi Matt,
>
>My best view of the veins is by photography, which is not my best talent, but the 'shine'
>of the veins match the 'shine' of the FeNi flecks, so I am making the assumption they are
>of the same minerology. I know - when I assume I make an 'ass' of 'u' and 'me'. LOL I
>will have to look into this further to be sure. Did you see the closeup picture at;
>
>http://www.meteorite-dealers.com/images/northbranch4-2b.jpg
>
>It does not show it, but just now I put on my strongest glasses and used a loupe to look
>closer. The vein does cross the edge of the partslice and on the opposite side looks
>more like a shock vein, not being filled full with the 'shiny stuff'.
>
>Would FeNi flow into a shock vein during the higher temp stage of atmospheric entry?
>Would hematite? I don't know how to explain this as I am relatively new to observing
>details of slices and am only stating what I see.
>
>Any enlightenment would be very welcome.
>
>Gary
>
>On 14 Jan 2007 at 15:26, Matt Morgan wrote:
>
>
>
>>Hi Gary:
>>Are you certain those are Fe-Ni veins? I had a good chunk of NB and the
>>only veins were Fe-Oxides, in particular, hematite. NB is a pretty
>>weathered H5; I remeber it was coated with a several-mm-thick rind of
>>shale and a good amount of caliche.
>>Blaine Reed had/has the main mass, and it was HUGE...
>>Best,
>>Matt
>>
>>Gary K. Foote wrote:
>>
>>
>>
>>>I've just received an excellent small part slice of Northbranch from the Hupe'
>>>Collection. It displays some unbelievable veins of FeNi, one of which crosses the whole
>>>specimen. I'm proud to have added this fine Northbranch to my collection;
>>>
>>>http://www.meteorite-dealers.com/northbranch.html
>>>
>>>Gary
>>>http://www.meteorite-dealers.com
>>>
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>>>
>>>
>>>
>>>
>>>
>>
>>
>
>
>
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Received on Sun 14 Jan 2007 05:47:39 PM PST