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Re: NYC Museum of Natural History Collection

I had seen the Widmanstatten patterns on Agnihito at the museum in NY.  All
of this talk has prompted me to take a closer look at a 4kg Gibeon in my
collection and there are a couple of areas where I can see a small amount
of crystal structure. So I don't believe you necessaril need a world class
iron to see this, if by world class you mean LARGE.

Mike

At 17:54 21.04.97 -0600, you wrote:
>I have seen the pattern you speak of on the Cape York. In fact, I think I
>have a picture of it somewhere.  I will look.  It is unique.  I remember it
>looking like rusty burlap.
>
>It is too bad you did not see the Willamette.  That is one amazing iron.
>Had you been able to look just as closely at the Willamette as you did the
>Cape York, you would of seen small crystal-like inclusions peeking out
>through the oxide layer.  Maybe one needs a world-class iron to see these
>features.
>
>
>This morning, I posted a note, but never received a copy of it myself.
>Here it is again.  Sorry if it came through, but I never saw it on the list
>and I think it may not have gone through.
>
>Morining posting:
>I feel rather foolish for not having checked the primary sources with
>regard to study of the Sikhote-Alin meteorites. Therefor I now feel
>obligated to point out that back in the 1950's, Krinov discussed and
>photographed the unusual "craters" on S-A individuals.
>
>As I was examining several Sikhote-Alin shrapnel specimens, I discovered
>several "crater-like" features. I had seen the "craters" on crusted
>individuals but not on shrapnel pieces.  I thought maybe my discovery would
>provide more insight into this "mystery." Since I reread Gallant's
>wonderful S-A article (Sky & Telescope, Feb. 1997) during Sunday breakfast,
>I thought maybe I should read more by Krinov about the S-A meteorites. I
>found that Krinov addressed this features in Principles of Meteoritics
>(1960 Pergamon Press).
>
>On pages 276-277, Krinov wrote:
>"Small hemispherical pits are scattered upon the meteorites with diameters
>measured in fractions of a millimetre and rarely reaching one or two
>millimetres. Around such pits the characteristic fringe is usually
>observed. These pits are formed by bubbles of gas which separate from the
>meteorites at the moment of crustal formation.  At the beginning within the
>hardening layer of crust there appears a bubble, which upon bursting,
>leaves within the viscous layer a pit with a fringe around its edge. The
>little bubbles of fine film that tear away, solidify rapidly and turn into
>the tiny flasks discovered along with the globules in the soil in the
>region of the fall of the Sikhote-Alin meteorite shower are a component
>part of meteoric dust."
>
>Krinov continues about these features and several other characteristic to
>the S-A specimens.  On page 277, there is a photograph showing an
>individual with the "pit" feature.
>
>I guess, as the saying goes, if we don't study the past, we are doomed to
>repeat it. Or at least think we discovered something new.
>
>Martin Horejsi
>
>
>
>
References: