[meteorite-list] Fusion Crust on Irons

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Mon, 4 Dec 2006 18:03:41 -0800 (PST)
Message-ID: <698608.66188.qm_at_web36906.mail.mud.yahoo.com>

Hi all -

Might non-iron inclusions explain some of the
crusting?
Might iron meteorites with inclusions actually
fragment along inclusions during entry? Or might
heating the inclusions cause fragmentation?

I don't remember (hell, now a days I don't remember
much of anything) any inclusions in Sikote Ailins, but
from the notes here the "crusts" seem to pool in the
remaglyphs (or is that vugs?) in these.

Just some thoughts in the night.

good hunting,
Ed




--- Dave Freeman mjwy <dfreeman at fascination.com>
wrote:

> Would "shikote Alin"-like crust work? Blue steel,
> burn baby burn!
> Dave F.
>
> MexicoDoug wrote:
>
> >Hi Gary,
> >
> >Fusion crust can be in the eyes of the beholder, so
> the difficulty with this
> >question is we are making a one-size fits all
> definition.
> >
> >For the irons, you could get a verrrry thin local
> destruction of any
> >crystalline patterns or figures (no longer etch),
> some chemical change from
> >'burning' up including colors. In the case of
> stones, it is a different and
> >typically a glazed-silicate ceramic crust forms.
> It can get a rainbowish
> >tint from burnishing, though it usually looks
> somewhat bluish. It's so thin
> >that it quickly is lost to other mineralization in
> the oxidizing humid
> >environment that is earth's.
> >
> >So there is a difference. But loosely thay can all
> be attributed to
> >'fusion' though in the case of iron it has a
> different characteristic. In
> >either case, when the fusion crust is black, this
> is generally caused by
> >oxidized iron during the entry, not
> terrestrialization. That is a main
> >difference between what we see on many older irons
> in dry and stable
> >environments.
> >
> >So, yes, irons can have a fusion crust, it is just
> not predominantly a
> >ceramic kiln glaze best seen from some achondrites,
> which is the classic...
> >
> >Best wishes, Doug
> >
> >
> >----- Original Message -----
> >From: "Gary K. Foote" <gary at webbers.com>
> >To: <Meteorite-list at meteoritecentral.com>
> >Sent: Monday, December 04, 2006 1:26 PM
> >Subject: [meteorite-list] Fusion Crust on Irons
> >
> >
> >
> >
> >>Hi All,
> >>
> >>Recently I have read a few posts to this list that
> definitively claim that
> >>irons do not form a fusion crust. Yet, in
> Norton's "Rocks From Space",
> >>[pg 167 in my softbound edition] it clearly states
> the following;
> >>
> >>"Iron meteorites have the thinnest crust of all,
> usually only a small
> >>fraction of a millimeter thick. A fresh crust is
> blue-black to black and
> >>looks like freshly welded steel. This crust is
> fragile and easily
> >>destroyed if the meteorite weathers for even a
> short time."
> >>
> >>So, which is true? Crust or no crust for irons?
> >>
> >>Gary Foote
> >>http://www.meteorite-dealers.com
> >>
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> >>
> >>
> >>
> >
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> >
> >
> >
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Received on Mon 04 Dec 2006 09:03:41 PM PST