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 <[EMAIL PROTECTED]> wrote: > The only chondrite Ive ever had this problem with is > Ghubara. > Mike Farmer > ----- Original Message ----- > From: "capricorn89" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; "Mal > Bishop" > <[EMAIL PROTECTED]> > 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 <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > 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: [EMAIL PROTECTED] Sale Site: http://www.mcomemeteorite.com Collection Site: http://www.mcomemeteorite.info International Meteorite Collectors Association #2140 MSN Messanger: [EMAIL PROTECTED] EBAY.COM:http:[EMAIL PROTECTED]/ __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! 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