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

[MEM]

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