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

From: Matteo Chinellato <mcomemeteorite2000_at_meteoritecentral.com>
Date: Thu Apr 22 10:04:51 2004
Message-ID: <20020522064841.4004.qmail_at_web10302.mail.yahoo.com>

And El Hammami, but few pieces, have this, see my 40
gr. piece in collection, is complete brown and the
rusty exit forever.
Regards

matteo


--- Michael Farmer <farmerm_at_concentric.net> wrote:
> 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.
>
=== message truncated ===


=====
M come Meteorite - Matteo Chinellato
Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY
Email: mcomemeteorite2000_at_yahoo.it
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International Meteorite Collectors Association #2140
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Received on Wed 22 May 2002 02:48:41 AM PDT