[meteorite-list] Dronino Preservation

From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Thu Jan 19 09:42:07 2006
Message-ID: <43CF5EB0.9024.7FE37F_at_localhost>

I'm thinking that a preservation section of my website might be useful. Break it down by
type and even fall by fall. I would like the permission of anyone who has posted on this
subject to use their credited info as content. Can do?

If yes, can you resend your posts to me as I have not kept them all. Gotta get lighter
on the old delete key. :)

And if you have specific preservation info or processes you have not posted I would like
to include whatever you wish to share. Send to my private email gary_at_meteorite-
dealers.com

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

On 19 Jan 2006 at 8:28, Bob King wrote:

> Hello Bernd, Marcin and all,
>
> I, too have had problems with Dronino until I used Steve Schoner's
> NaOH method. I left my slice in solution in a jar for two weeks. Every so
> often I'd pick up the jar and swirl the contents around to keep the
> chemicals mixed and monitor the process . The solution gradually
> became as dark as maple syrup as rust was dissolved. Then I removed
> the slice, washed it in distilled water (the lye makes the pieces very
> slippery.) and baked it in the oven for an hour at around 200 degrees.
> I still keep my Dronino with dessicant but I have not seen a speck of
> rust since this treatment.
> Marcin, you asked about dissolving the lye. I fill the jar halfway with
> regular isopropyl alcohol (off-the-shelf drugstore variety) which contains
> water. Then I add about 5 tablespoons of lye (Red Devil brand here in
> the U.S.) and stir and stir. It takes a while for the lye to dissolve in the
> alcohol. While this is happening you get an interesting exothermic
> chemical reaction and the jar warms up.
> Anyway, this is the only thing that's worked for really stubborn irons.
> Best to all,
> Bob
>
>
> Subject: [meteorite-list] Dronino Preservation
>
> > Stefan wrote:
> >
> > "Just watching the slow disintegration of my little 63g Dronino individual.
> > Not the prettiest way of losing weight...Any chance of preserving it from
> > total crumbleation?"
> >
> > Matteo responded:
> >
> > "Dronino its a horrible rust meteorite, for the moment the 2th only after
> > Campo del Cielo."
> >
> > Don't forget Nantan...another rust bucket. I had a nice Nantan individual
> > that I purchased at a mineral show in Ulm (Germany) in 1999. About two
> > years later it had rusted and crumbled almost beyond recognition.
> >
> > Morasko can also be very, very prone to rusting. My little piece from ...
> > looks jet-black as if HCL had been poured over a lump of sugar :-(
> >
> > Luckily I was careful enough because I bought only a small 12-gram endcut
> > which I observed rusting away in spite of the silica gel I used to protect it.
> >
> > Dronino is a very difficult candidate because of its large amount of sulfides
> > (about 10vol%!). Moreover, its sulfide nodules are usually surrounded by Fe
> > hydroxides, ... a fateful combination with regard to hard-to-stop rusting :-(
> >
> > Cheers,
> >
> > Bernd
> >
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>
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Received on Thu 19 Jan 2006 09:41:04 AM PST