[meteorite-list] Paint/chondrite formation &FeNi

From: Steve Witt <stelor96_at_meteoritecentral.com>
Date: Thu Apr 22 09:48:13 2004
Message-ID: <20011019182250.34274.qmail_at_web9608.mail.yahoo.com>

     Greetings list,

   As the subject of this post indicates, I have two completly
different subjects that I have questions on.

   First, on alot of old specimens (and a few new ones) I've seen
white rectangles painted? on the specimen with an I.D. # or whatever
written on it. My questions are, is this paint? Could white out be
used in it's stead? And, if at some time in the future I wanted to
remove the material(s) how difficult would it be to do this? I'm
referring to this as it relates to stony meteorites.

   Secondly, and totally unrelated, I was thumbing through "Rocks
from Space" last night (for about the gabillionth time) and was
reading about when the first elements began to condense from the
solar nebula, it mentions in chapter 18, page 335 that... "Metallic
iron alloyed with nickel condensed with the first silicates, probably
forming the metal flakes found in chondrites". It is mentioned in the
following chapter that " Gas pressure was not high enough at that
time to allow liquid mineral drops to form from the gas" So the
silicates condensed as grains, which clumped together, and as a
result of later intense heating by the protosun these silicates were
heated to their melting point, which in liquid state in space formed
droplets, which were later cooled and became what we know as
chondrules today. My question; wouldn't it follow that the FeNi alloy
would be similarly melted, forming droplets which would later cool
and instead of us seeing metal flakes, why don't we see round and
semi-round chrondritic shaped FeNi inclusions in chondrites? (Do I
have too much time on my hands)??

  As always any help on the above would be greatly appreciated.

                        thanx,
                        Steve

   

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Received on Fri 19 Oct 2001 02:22:50 PM PDT