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" <[EMAIL PROTECTED]>
To: <[email protected]>
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" Dameräu
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: [EMAIL PROTECTED]
[mailto:meteorite-list-
[EMAIL PROTECTED] On Behalf Of Gary K. Foote
Sent: Tuesday, January 30, 2007 6:21 PM
To: [email protected]
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
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
Meteorite-list mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
Meteorite-list mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________
Meteorite-list mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
