[meteorite-list] Northbranch H5

From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Sun, 14 Jan 2007 18:02:01 -0500
Message-ID: <45AA7019.27614.8D59C8_at_localhost>

Thank you Matt,

I am now looking at specimens of both online and, of what I have seen, Portales Valley is
very spectacular. This is the pic that caught my eye in the Monnig Museum;

http://monnigmuseum.tcu.edu/media/hi-res-downloads/meteorite-portales-valley.jpg

It shows shock veins and spectacular metal inclusions. I assume [there is that word
again] that the metal is FeNi. The shock veins look empty of metal inclusions in this
specimen.

The Etter I have seen so far shows something like dotted lines of either FeNi or FeOx -
I'm way out of my league here so can't say which.

I'm off to see more samples of Northbranch for comparison online now...

Ever learning I Remain,

Gary

On 14 Jan 2007 at 15:47, Matt Morgan wrote:

> 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 06:02:01 PM PST