[meteorite-list] Etching Iron Meteorites

From: Dave Freeman mjwy <dfreeman_at_meteoritecentral.com>
Date: Wed, 31 Jan 2007 17:07:40 -0700
Message-ID: <45C12F4C.5040703_at_fascination.com>

Dear Sterling;
Why don't you ask the chinese? They seem to be the most interested in
faking meteorites.
Dave F.
a non tucsonisti

Sterling K. Webb wrote:

>Hi, Drake,
>
>
>
>>...Widmanstatten patterns are unique to
>>meteorites. That's not true.
>>
>>
>
> I'll bite. In what other materials can they be found?
>Long considered definitive hereabouts. I quote one
>source: "Widmanstatten pattern or Thompson structure:
>This pattern does not appear in terrestrial iron ores.
>Its presence is diagnostic in the identification of a
>meteorite."
> Looking for a definition, I found that they form when
>"steels are cooled at a critical rate from extremely high
>temperatures. It consists of ferrite and pearlite and
>has a cross-hatched appearance due to the ferrite
>having formed along certain crystallographic planes."
> What's the likelihood of fake meteorites being made
>that way?
>
>Sterling K. Webb
>------------------------------------------------------------
>----- Original Message -----
>From: "Drake" <Monel at sprynet.com>
>To: <meteorite-list at meteoritecentral.com>
>Sent: Wednesday, January 31, 2007 4:52 PM
>Subject: Re: [meteorite-list] Etching Iron Meteorites
>
>
>That was I, and thank you. The Nital I was using was what I use for
>standard metallographic sample preparation at 2% to 5%. I see now I need
>a much higher concentration.
>
>I did find one metallurgical error in that it states that Widmanstatten
>patterns are unique to meteorites. That's not true.
>
>Drake
>
>Quis Custodiet Ipsos Custodes
>
>Drake "Doc" Damer?u
>President, NEPRA
>NAR Section 614
>L3CC member
>TRA 9934 L3
>
>www.nepra.com
>www.rocketmaterials.org
>http://home.sprynet.com/~monel/home.htm
>
>
>
>
>
>
>>-----Original Message-----
>>From: meteorite-list-bounces at meteoritecentral.com
>>
>>
>[mailto:meteorite-list-
>
>
>>bounces at meteoritecentral.com] On Behalf Of Gary K. Foote
>>Sent: Tuesday, January 30, 2007 6:21 PM
>>To: meteorite-list at meteoritecentral.com
>>Subject: [meteorite-list] Etching Iron Meteorites
>>
>>Hello List,
>>
>>I forget who was asking this morning, but Ruben Garcia has graciously
>>allowed me to
>>publish his in-depth article on cutting, etching and preserving iron
>>meteorites to my
>>site.
>>
>>For those interested the URL is;
>>
>>http://www.meteorite-dealers.com/etchingandpreservation.html
>>
>>Gary
>>http://www.meteorite-dealers.com
>>______________________________________________
>>Meteorite-list mailing list
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>>
>>
>
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>
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Received on Wed 31 Jan 2007 07:07:40 PM PST