[meteorite-list] Rusty droplets

From: mark ford <markf_at_meteoritecentral.com>
Date: Fri, 8 Jun 2007 09:14:57 +0100
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31293CE7_at_s-southern01.s-southern.com>

Hi Giovani,

Yes firstly take them out of plastic! Any moisture/chemicals trapped in
the rock will stay in the rock if it is in plastic, you only want to put
dry, stable material into plastic boxes, (or use dessicant/silica gel
with the rock and recharge it regularly).

As Adam suggested you can also use Iso-alcohol (pure ethanol) it's good
for getting rid of moisture in extreme cases but make sure it is 'pure
anhydrous alcohol' or you will be putting more water in than you take
out! - also gently warm the slice afterwards to drive off any moisture
then sand with very very fine sanding paper.

They also preferably need to be kept somewhere dry like inside a cabinet
with dessicators inside, or better still a dehumidifier.

Most slices reach a stable point eventually once you have done this!

Best
Mark Ford





-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
giovannisostero
Sent: 07 June 2007 19:15
To: meteorite-list
Subject: [meteorite-list] Rusty droplets

Hi,
I noticed that a coupled of slices (Ghubara and NWA 869) I bought few
months ago from two different dealers, are producing some small liquid
droplets of rusty appearance. After cleaning, the droplets develope
again in a matter of few weeks. Any idea about how to cure it? The
samples are stored in plastic envelopes but without any particular
desicant.
Cheers,
Giovanni


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Received on Fri 08 Jun 2007 04:14:57 AM PDT