[meteorite-list] Fusion Crust on Irons

[MexicoDoug]

Yeah, Alex!

OK, David, so then, that rim on Boguslavka is the "alpha-2 zone" of the 
ablated surface.

Here's photo I just took of the piece I contracted from Cladni Heirs, 
terrible photo, but it shows beautifully that fusion heated rim (could be 
called part of the fusion crust I guess - but probably that's not 
scientifically ok, as it is not crusty but just heat-affected).  The heat 
affected area that lost the structure is about 0.9mm in thickness (and so it 
is actually from ablative heating).  Compare this photo with Martin's edge 
on slice where you can see that sliver thin burnished flakey fusion crust on 
top of this bright rim...

http://www.diogenite.com/Bogy.jpg

Thanks Metalmen

Best wishes, Doug

----- Original Message ----- 
From: "Alexander Seidel" <gsac at gmx.net>
To: "Martin Altmann" <altmann at meteorite-martin.de>; 
<meteorite-list at meteoritecentral.com>; <MexicoDoug at aim.com>
Sent: Monday, December 04, 2006 6:26 PM
Subject: Re: [meteorite-list] Fusion Crust on Irons


>> Crusty the Clown crows:
>> www.meteoritenhaus.de/img/BoguslavkaCrust1.jpg
>
> Boguslavka!!! Great iron, great Neumann lines (IIAB Hex)! Hey, I´m most 
> critical regarding irons potentially rusting. But this has been a very 
> stable one ever since it resides in my collection. In case Chladni´s heirs 
> have more of this for sale, I recommend --> go get it!
>
> I have a Hoba slice in my collection, no, not the usual shale stuff, but a 
> solid genuine slice - with a very good handover history from at least two 
> of its (well-known) pre-owners. This one shows what one would 
> superficially call a "good crust", and when I bought it many many many 
> years ago as a newbie from a well-known collector, I admit I still had to 
> do a little research on it afterwards for myself why it looks how it 
> looks. Crust on irons, but not only there, may be quite a tricky thing to 
> have it interpreted correctly.
>
> (No, the Hoba is not for sale).
>
> Alex
> Berlin/Germany
>