[meteorite-list] Irons and fusion crust

[Dave Freeman mjwy]

Dear Crusty's;
I think the whole deal here with "fusion crust" which is what I choose 
to call it, all boils down to what academia and thus the rest of us 
mortal ones choose to call "fusion crust".
We have discussed this issue numerous times here and it very much 
relates my thought to President Clinton's comment a while back,
"No I did not have sex with that woman"......well, one has to define sex 
first.  Agreement was that something occurred, just how to define it.

Call it a glassy altered surface deposit if you like and it makes you 
feel good but in my feeling, anything other than an iron surface, and 
anything that has been effected by an iron meteorite blasting through 
the atmosphere and directly related to the affects of heating as a 
result of passing through the Earth's atmosphere should be categorized 
as fusion (because it was hot and burned) crust (because it is on the 
exterior surface of) a meteorite.   Don't care if it  is glassy or 
melted cheese whiz. Don't care if it is .000001 mm in thickness or a 
full two inch thick crusty black nasty stinky filthy burned rotten 
yam..........if it is a result of heat of entry, and on the surface of 
an iron meteorite when fresh or relatively freshly occurred, then it 
might be a fusion crust.
Just my 2 sense'.
Dave Freeman
with more sense than some



Michael Farmer wrote:

>I completely agree that iron meteorite falls have
>fusion crust. Come on, they meteorites are often
>covered with frothy blue-black crust, sometimes 2 or 3
>mm thick, it flackes off, it was caused by the fusion
>of iron minerals while burning at thousands of degrees
>on entry, exactly the same way silicates form fusion
>crusts on stones. Thus, we have two different types of
>materials, burning, and when they land, they have a
>surface of crust comprised of molten material due to
>heat alteration. 
>How can that not be called a fusion crust?
>Michael Farmer
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