[meteorite-list] acid for pallasite

From: John Cabassi <john_at_meteoritecentral.com>
Date: Tue, 20 Sep 2016 20:23:23 -0700
Message-ID: <CAFBTX4zA=S3c4S4MpXAKVO3gEGU7wwZ5SC+tAZZokqsazUOknw_at_mail.gmail.com>

Francesco and All,
I understand where you're coming from. You have a pallasite slice/end
cut that apparently was not cut properly. By that I mean, the final
prep work so you have some moisture trapped inside the item which has
led to rust developing between the iron/nickel and the
olivine/peridot. The olivine/peridot has popped out but because it
has accumulated rust residue, it won't go back where it came from. I
suggest drying it out manually cleaning up the rust on the surface of
the olivine/peridot as well as cleaning up the actual socket (I
haven't used that one in a long time) that the olivine/peridot has
fallen out of.

I would not go to the point of acid. I would put on some glasses with
magnification, spend a little time slowly cleaning up both surfaces
and proceed with putting the jigsaw back together

Cheers
John

On Tue, Sep 20, 2016 at 5:54 PM, Gmail via Meteorite-list
<meteorite-list at meteoritecentral.com> wrote:
> Francesco,
>
> I am obviously in the minority, but I thought you wanted to keep the
> pallasite whole and just wanted to get rid of rust. Re-reading the email, it
> does seem that you may want to dissolve the iron to extract the olivines. If
> you want to extract the olivines, be aware that whatever acid you use will
> need to be very concentrated and VERY dangerous.
>
> The risk/reward and return on investment seems hardly worth it.
>
> Best,
>
> Mendy Ouzillou
>
> On Sep 20, 2016, at 11:49 PM, CRAIG MOODY via Meteorite-list
> <meteorite-list at meteoritecentral.com> wrote:
>
> The very thought of it makes me cringe. The chances of getting crystals
> worthy of gem-stones, is slim. IMHO it would be sacrilege to destroy one of
> the most beautiful meteorite types, for a few gems and a little cash.
>
> On 09/20/16, Gmail via Meteorite-list <meteorite-list at meteoritecentral.com>
> wrote:
>
> Depending on the pallasite (is the cost of rehabilitation worth it) and the
> extent of rust damage, you can pursue different options. If there is rust
> between the olivines and iron, you will likely have to use an electrolytic
> process. KD Meteorites are the experts in doing this. If it is just a little
> bit of rust, then relish and then etch with Nital.
>
> Mendy Ouzillou
>
> On Sep 20, 2016, at 10:43 PM, Francesco Moser via Meteorite-list
> <meteorite-list at meteoritecentral.com> wrote:
>
> Hello!
> Wich kind of acid I can use for dissolve the iron/rust in a Pallasite, so I
> can save the Olivine?
>
>
> Thanks a lot!
>
> <x>x<x>x<x>
> Francesco
>
>
>
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Received on Tue 20 Sep 2016 11:23:23 PM PDT