[meteorite-list] RE: Nice Dronino?

From: JKGwilliam <h3chondrite_at_meteoritecentral.com>
Date: Fri Nov 26 00:22:24 2004
Message-ID: <6.0.3.0.2.20041125221028.028da4e0_at_pop.west.cox.net>

Have any of you who are fighting with rust/decay problems with Dronino
tried storing with desiccant in an airtight container after treating with
the alcohol/NaOH bath?

I can remember Steve Shoner telling the list about using the alcohol/NaOH
solution bath. As best as I can remember, he was the developer of this
process and had tested it over a long period of time. Two weeks in the
bath might not be enough. If the solution becomes discolored, put the
specimen in a fresh batch of the solution and remember to stir it gently
every day. Some stubborn meteorites might take months in the solution to
produce the right effects.

Maybe Steve can enlighten us one more time on this subject.

Best,

JKG

At 09:23 PM 11/25/2004, Jonathan Gore wrote:
>I thought it wasn't a good idea to store meteorites in plastic bags. I
>would think storing it in a bell jar with the air evacuated would stabilize it.
>
>Just a thought....
>
>Jonathan
>
>Pekka Savolainen wrote:
>>Nope, as far as I know. This mirror-polished fellow was
>>stored in the air-tight plastig-bag, and some 10 months it
>>was a real beauty. Then it started to rust very fast, or in
>>fact not only to rust, perhaps "boiling" is a good word for
>>the process...;-
>>The beauty today;
>>http://www.dlc.fi/~nuuska/dronino.jpg
>>best,
>>pekka s
>>Jonathan Gore wrote:
>>
>>>Would storing it in a vacuum work?
>>>
>>>Pekka Savolainen wrote:
>>>
>>>>
>>>>Well, have tried everything except black magic and woodoo...;-
>>>>Dronino is a quite old one, accordindg Verdansky from before
>>>>12:th century. Main part of the pieces was found from the very
>>>>wet area, so I suppose, the chlorides are not the only problem...,
>>>>the meteorite is just too old and have spent too much time in a
>>>>wet soil.
>>>>
>>>>http://www.geokhi.ru/~meteorit/dronino1-e.html
>>>>
>>>>As I told in my former e-mail, after all tricks my pieces stayed
>>>>stable some 8 - 10 months, the pieces without any methods to
>>>>stabilizie them couple of weeks, not much longer.
>>>>
>>>>If some happens to find to way to stabilizate this very interresting
>>>>meteorite indeed, please, let me know...
>>>>
>>>>best,
>>>>
>>>>pekka s
>>>>
>>>>
>>>>
>>>>Stephen McMann wrote:
>>>>
>>>>>Dear Pekka and List,
>>>>>
>>>>>Has anyone ever tried some of the tried and true iron stabilization
>>>>>techniques on Dronino, such as a long bath in an alcohol and NaOH rich
>>>>>solution to remove chlorides? On a related subject, I guess that I may not
>>>>>really understand the chemistry behind why some meteorites are stable, and
>>>>>some are not. Perhaps I will naively ask, "Is it all about chlorides?"
>>>>>
>>>>>Sincerely,
>>>>>
>>>>>Stephen McMann
>>>>>
>>>>>-----Original Message-----
>>>>>From: Pekka Savolainen [mailto:pekka.savolainen_at_dlc.fi] Sent:
>>>>>Thursday, November 25, 2004 5:33 PM
>>>>>To: Stephen McMann
>>>>>Cc: meteorite-list_at_meteoritecentral.com
>>>>>Subject: Re: [meteorite-list] Nice Dronino?
>>>>>
>>>>>
>>>>>They are not stable. The older pieces was slag in a few weeks or months,
>>>>>the new "stable" ones in 8 - 10 months. I have just one very thin
>>>>>piece not
>>>>>distroyed, just because it has a quite heavy lacquer. Fastest ruster I
>>>>>have
>>>>>ever seen ;-
>>>>>
>>>>>best,
>>>>>
>>>>>pekka
>>>>>
>>>>>
>>>>>______________________________________________
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>>>>>
>>>>>
>>>
>
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Received on Fri 26 Nov 2004 12:21:21 AM PST