[meteorite-list] Lawrencite-like oozing from an H6 Impact Melt Breccia

From: Michael Farmer <farmerm_at_meteoritecentral.com>
Date: Thu Apr 22 10:04:51 2004
Message-ID: <000c01c2015c$7773ec20$3a34b1d0_at_computer>

The only chondrite Ive ever had this problem with is Ghubara.
Mike Farmer
----- Original Message -----
From: "capricorn89" <capricorn89_at_earthlink.net>
To: <meteorite-list_at_meteoritecentral.com>; "Mal Bishop"
<magbish3_at_bellsouth.net>
Sent: Tuesday, May 21, 2002 11:31 PM
Subject: Re: [meteorite-list] Lawrencite-like oozing from an H6 Impact Melt
Breccia


> Hi Mal,
>
> Yes, believe it or not stones can and do have the "Lawrencite" disease.
The
> same greenish-ooze! There is considerable iron in stones too, and it does
> happen. I have an El Hammami that is terrible in this regard, and some
> Saharan H chondrites as well. I'd treat it the same way as you have, in
> anhydrous alcohol (not even 99%).
> Blot the ooze at once, don't let it get started, and change the alcohol
> often until it stops. It will give up eventfully.
>
> Ron Hartman
>
> ----- Original Message -----
> From: Mal Bishop <magbish3_at_bellsouth.net>
> To: <meteorite-list_at_meteoritecentral.com>
> Sent: Tuesday, May 21, 2002 5:10 PM
> Subject: [meteorite-list] Lawrencite-like oozing from an H6 Impact Melt
> Breccia
>
>
> > Hi List,
> >
> > First of all, "Hi", to everyone on the list new and old, and I don't
mean
> > age wise! :-)
> >
> > I'll get to my question in a minute, but I wanted to make an observation
> first.
> >
> > I've been on and off of the list for 3 or 4 years, but lately (last year
> or
> > so) mostly
> > a lurker. Back in the earlier days there were some on this list more
> > interested
> > in stirring up the "mix" so-to-speak than carry on any meaningful
> dialogue,
> > transfer of knowledge, or just plain enrich the passion of others on the
> > list that really
> > wanted to "talk" meteorites! After a few unpleasant run-ins and
realizing
> > that it
> > appeared the list was really nothing much more than an on-line market
for
> > dealers
> > and collectors wishing to trade/sell meteorites, and most of the
remaining
> > threads
> > involved the aforementioned malarkey, I just kind of slipped into the
> > background and hung
> > around waiting for that relatively rare and interesting tidbit of info
> > actually concerning
> > meteorites! There were a handful of regular contributors, and experts
> that
> > came
> > through back then just as they still do today, and I think most of you
> know
> > the individuals
> > I'm referring to!
> >
> > The reason for the above statement is to my great pleasure and
enjoyment,
> > this list has changed for the better and is getting better all of the
> time.
> > I think there were many members, in fact I know there were some members
> for
> > they emailed me privately with the same concerns, whom would not join in
> > out of
> > fear of being ridiculed and harassed. Well, it seems as if it is all
> water
> > under the bridge now!
> >
> > Now to my question... I recently purchased a beautifully prepared part
> > slice of Dhofar 010
> > which is an H6 impact melt breccia. It shows a very dark black melt
(the
> > matrix material)
> > surrounding the lighter brown unmelted clasts sparkling with tiny bits
of
> > metal. I've had it now for almost a month.
> > The past week, week and a half, I noticed that it has dark, brown,
> greenish
> > looking droplets of moisture
> > oozing out on the back unpolished side and a couple of droplets on the
> > front highly polished side. Right away I thought Lawrencite
> > and Nantans not to mention a couple of other irons and Pallasites, but
> this
> > is an ordinary chondrite (H6)
> > and I just haven't heard of this problem with chondrites. If they
> > [chondrites] can have the "disease" as well
> > as irons then I'm just ignorant of it! Even under just a 10x magnifier,
> it
> > looks like the "cancer" of irons as,
> > I think, Richard Norton put it. I have or had many different types of
> > chondrites, and many of course, are or were
> > ordinary ones from LL's to H's an 3's to 6's, but I never saw this
before
> > -- I haven't read or heard anyone else speak of this either!
> > When I wipe the moisture off, it will have returned again within the
next
> > day or two.
> >
> > Another interesting fact is that the oozing appears to be coming from
the
> > melt (matrix) surrounding the
> > clasts (breccia) on the back side and not from any of the clasts
> themselves
> > that I can tell. Of course, I could
> > be very wrong for I'm by no means an expert -- just learning all the
time.
> > The polished front side seems to really have only one area and it is a
> tiny
> > clast, but this clast has a couple
> > of small holes or pores -- therefore, I suspect it's just bleed through
> > from the back side where the melt happens
> > to line up from behind that particular clast!
> >
> > Believe it or not, in the past with a couple of Nantans that after
cutting
> > started oozing very badly, I'd soak
> > them for days, weeks, and even months in anhydrous isopropanol
(isopropyl
> > alcohol). When the solution
> > began looking brown or somewhat less than perfectly clear (to my
> subjective
> > eye) I would exchange it
> > for pure alcohol again. I would do this probably 2,3, or 4 times
> depending
> > on the tenacity of the iron involved --
> > maybe more. This stuff I use is 99.995% water free and it WILL dry out
> > whatever you have in mind -- including your fingers! ;-)
> > But the point is, after whatever period of time it took and the
particular
> > Nantan piece involved, I eventually
> > got the blasted thing to stop oozing. One I'm soaking right now has
been
> > in solution for nearly one year.
> > I take it out occasionally and just let it sit for several days to see
if
> > it begins oozing again, so far, so good!
> > My next step will be to let it sit in the display case for several weeks
> > and keep an eye on it. If all goes well
> > I may or may not clearcoat it.
> >
> > I said all of that just to point out nothing, I guess really, with my
> > question at hand other than if nothing else the alcohol
> > bath should do the same trick if it is Lawrencite or something
> > related. Like I said though, I'm far from any expert with
> > preparing, conditioning, and maintaining irons or any meteorite (or
rock)
> > for that matter, but I try a little, learn a little,
> > read a little, and learn a little more!
> >
> > SORRY for the lengthy email, but I'm just curious, concerned, and ready
to
> > learn more from this distinguished
> > and informed list of members!
> >
> > Anybody have any answers, similar occurrences, or whatever?
> >
> > Regards,
> > Mal
> >
> >
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list_at_meteoritecentral.com
> > http://www.pairlist.net/mailman/listinfo/meteorite-list
> >
>
>
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Received on Wed 22 May 2002 02:46:54 AM PDT