[meteorite-list] Campo Preservation

From: Adam Hupe <raremeteorites_at_meteoritecentral.com>
Date: Tue Jan 17 22:18:06 2006
Message-ID: <052f01c61bdc$37f07b60$6401a8c0_at_c1720188a>

Hi Gary and List,

I only dry polish a second time when I run into secondary oxidation during
preparation. I stay away from problem stones that show rust and can't be
stabilized. I will not collect any rusters other than New Orleans and
Peekskill. I live in a damp state meaning I have to be careful what I
collect. I once had complete slices of both the Brenham and Brahim
pallasites. I was shocked to see both rust away within two years when I
inventoried my safe which was equipped with VCI emitters meaning the
moisture was trapped inside the specimens. The Brahim was actually flexible,
the only thing holding it together was the lacquer coating. The Brenham
crumbled into a pile of rust and crystals. I was so completely disgusted
since I paid top dollar for both at the time that they went right into the
trash. Out of site, Out of mind is how I justified their disposal.

Take Care,

Adam



----- Original Message -----
From: "Gary K. Foote" <gary_at_webbers.com>
To: "Adam Hupe" <raremeteorites_at_comcast.net>
Cc: <Meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, January 17, 2006 4:09 PM
Subject: Re: [meteorite-list] Campo Preservation


> Hi Adam,
>
> Have you tried applying a dry polish first to see if it helps stabalize
things? Just
> inquiring.
>
> Gary
> http://www.meteorite-dealers.com
>
> On 17 Jan 2006 at 13:49, Adam Hupe wrote:
>
> > Hi Gary and List,
> >
> > This is a tough question to answer because each meteorite is different.
In
> > all cases that involve liquid polishing it is good to use distilled
water or
> > oil starting with coarse grits and going finer until the desired
contrast is
> > reached. I start with 180, then 220, then 360, then 600, then 1200 and
if
> > needed all the way up to 3000 grit. Sometimes I will stop at 360 or 600
if I
> > start losing contrast between the chondrules and the matrix. I always
dry
> > the specimen afterwards using a halogen lamp and do a final dry finish
by
> > hand. If rust appears, I apply a second dry polish. The surfaces then
seem
> > to fall into equilibrium with their new alien environment (Earth's
> > atmosphere).
> >
> > Take Care,
> >
> > Adam
> >
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> > http://six.pairlist.net/mailman/listinfo/meteorite-list
>
>
>
Received on Tue 17 Jan 2006 10:04:36 PM PST