[meteorite-list] Question: Lawrencite?

From: Michael Blood <mlblood_at_meteoritecentral.com>
Date: Thu Apr 22 09:37:33 2004
Message-ID: <3A33FA5C.1B6_at_home.com>

Kelly Webb wrote:
> Dear List,
> I have a help question for all who have seen more meteorites that me
> (which is pretty much everybody, I think).
> Is that lovely mossy green that can be seen on the following eBay
> item the dreaded Lawrencite Disease?
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=522033369
> Thanks. Sterling K. Webb
> _______________________________________________
Hi Sterling,
        No. Lawrencide disease is detectable by a yellow-rusty colored oozing
pus. What you MAY be seeing in the S-A photos could be a result of a
"color adjustment" made in a softwear processing program such as "Adobe
Photoshop." One can take a very rusty S-A photo and drive the extremes
of one color and minimize another. The result is a VERY dark image of
the specimen that appears almost black - and sometimes very glossy
black. Whenever I see that, I suspect rust covered up by digital color
adjustment. While that is not ALWAYS the case - it is the only way I
know of that can be done and I can't imagine why one would make those
color shifts if the specimen didn't have rust you wanted to conceal.
        In any event, in the photos on the site, I was impressed with a LACK
"white distortion" which inevitably occerrs when I mess with color
extremes, which is often nessessary to get a true color representation
in some lights. So, that may be all he was doing - though I see rust in
the photos, as is, anyway.
        DEFINATELY NOT LAWRENCITE DISEASE. (as far as I know, it is unknown in
S-A) Other list members may be more helpful.
        Best wishes, Michael

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Received on Sun 10 Dec 2000 04:49:18 PM PST