[meteorite-list] Question: Lawrencite?

From: tett <tett_at_meteoritecentral.com>
Date: Thu Apr 22 09:37:33 2004
Message-ID: <3A34067A.D823EFAB_at_bmts.com>

I agree. This is just image processing or trick of the light. Sikhotes do not
get the disease. Canyons and Campos and Brenham Pallasites are notorious for the
disease and it is awful!

Tett

Michael Blood wrote:

> 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
> --
> Why is "phonics" not spelled the way it sounds?
> --
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>
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Received on Sun 10 Dec 2000 05:40:58 PM PST