[meteorite-list] What's with these weird Campos?

From: MEM <mstreman53_at_meteoritecentral.com>
Date: Wed, 19 Jan 2011 21:08:16 -0800 (PST)
Message-ID: <12149.68914.qm_at_web161907.mail.bf1.yahoo.com>

Be it remembered that it is not so much water but salt/chlorine that affects
stability. I imagine that the expansion differences in iron oxide and native
metal when placed in liquid nitrogen is an effective spalder for knocking off
the shale portions and carrying away the chlorine ions. It is likely they are
also treated with some petroleum sealer.

As to etching-- if the shards are in fact fracturing along taenite/kamacite
boundaries then there should be no Widmanstaten patterns.

Elton




----- Original Message ----
> From: Bob King <nightsky55 at gmail.com>
> To: meteorite-list at meteoritecentral.com
> Sent: Wed, January 19, 2011 10:18:07 PM
> Subject: Re: [meteorite-list] What's with these weird Campos?
>
> Thanks everyone for all your replies. OK, so they appear to be blown
> up Campos. If true, they must have looked a lot more like shrapnel
> with sharp edges. It makes sense then, as Bob C. reported, that
> they're tumbled. If water's used in the tumbling process, I'm guessing
> these things will rust up quickly.
> Bob
>
> On Wed, Jan 19, 2011 at 9:04 PM, Meteorites USA <eric at meteoritesusa.com>
>wrote:
> > Yeah, I wonder if anyone's ever etched a Campo crystal before?
> >
> > Eric
Received on Thu 20 Jan 2011 12:08:16 AM PST