[meteorite-list] Campo Preservation

From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Tue Jan 17 16:44:08 2006
Message-ID: <43CD1E9E.21166.1D31A77_at_localhost>

Thanks Adam,

Good info - and it brings up yet another [which is probably in the archive somewhere] and
that is;

What do you consider proper polishing procdedures? Us beginners sure do ask dumb
questions, eh?

Gary
http://www.meteorite-dealers.com

On 17 Jan 2006 at 13:28, Adam Hupe wrote:

> Hi List,
>
> It is my belief that 90% of the preservation of meteorites is in the
> preparation. Meteorites should never be cut with tap water becuase it
> contains chemicals that start reactions, mostly corosive in nature! Any cut
> meteorite containing elemental metal should be polished on both sides to
> reduce the surface area which attracts moisture. Well-polished smooth
> surfaces do not need to be coated with laquer which traps moisture inside.
> If I suspect tap water was used in the preparation of any specimen I will
> walk away from it. If only one side of a slice is polished when I recieve a
> specimen, I will polish the second side. Not only is it good for
> preservation, collectors should be able to enjoy viewing both surfaces of a
> slice, it is just good business. The only exceptions are extremely rare
> meteorites that do not have elemental metal and Ureilites which destroy the
> polishing media.
>
> On another note, I noticed that Campos that were shattered after being
> frozen in liquid nitrogen do not seem to rust. The outcome of this technique
> are nice crystals that broke along the octahedral planes. This surprised me
> because another rule is not to have huge temperature swings when storing
> meteorites of more than 12 degrees Fahrenheit per hour.
>
> Just some thoughts,
> Take Care,
>
> ------------------------------------
> Adam Hupe
> The Hupe Collection
> Team LunarRock
> IMCA 2185
> raremeteorites_at_comcast.net
>
>
>
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Received on Tue 17 Jan 2006 04:43:10 PM PST