[meteorite-list] Thin Sections rusting
From: Frank Cressy <fcressy_at_meteoritecentral.com>
Date: Thu Apr 22 09:44:15 2004 Message-ID: <004901c10061$e67f1380$8334ff3f_at_pavilion> This is a multi-part message in MIME format. ------=_NextPart_000_0046_01C10027.393CE060 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hello thin section afficianados, The recent thread about cover slips/non cover slips got me thinking = about rust problems with thin sections. At my best count there are now = nearly a dozen dealers selling thin sections. Obviously viewing thin = sections with a microscope is becoming very popular, or profitable, = depending on your point of view.=20 I would think that none of the meteorite thin section dealers make their = own thin sections. Instead they send them off to commercial thin section = makers. In my opinion, a potential problem lies here in that these = commercial manufacturers deal primarily in terrestrial rocks where = rusting is seldem a problem.=20 I would hope that the sellers of meteorite thin sections inform their = manufacturers of potential rusting problems and have their thin sections = prepared using kerosene or whatever liquid is now used as a = slurry/coolant for "special" samples and not water. I looked at my slides of recent falls and about half are stained with = iron oxides around metal inclusions. Whether or not the staining = occurred prior to thin section manufacture or after is unknown but = suggests a potential problem to me.=20 I would suggest that anyone sending meteorite material out for thin = sections let their manufacturers know of their concern about rusting and = request that they be prepared without water. This should help mitigate = any potential rusting problems, with or without cover slides. Regards, Frank ------=_NextPart_000_0046_01C10027.393CE060 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Dwindows-1252" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2314.1000" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV>Hello thin section afficianados,</DIV> <DIV> </DIV> <DIV>The recent thread about cover slips/non cover slips got me thinking = about=20 rust problems with thin sections. At my best count there are now nearly = a dozen=20 dealers selling thin sections. Obviously viewing thin sections with a = microscope=20 is becoming very popular, or profitable, depending on your point of = view. </DIV> <DIV>I would think that none of the meteorite thin section dealers = make=20 their own thin sections. Instead they send them off to commercial thin = section=20 makers. In my opinion, a potential problem lies here in that these = commercial=20 manufacturers deal primarily in terrestrial rocks where rusting is = seldem a=20 problem. </DIV> <DIV>I would hope that the sellers of meteorite thin sections inform = their=20 manufacturers of potential rusting problems and have their thin sections = prepared using kerosene or whatever liquid is now used as a = slurry/coolant for=20 "special" samples and not water.</DIV> <DIV>I looked at my slides of recent falls and about half are stained = with iron=20 oxides around metal inclusions. Whether or not the staining occurred = prior to=20 thin section manufacture or after is unknown but suggests a potential = problem to=20 me. </DIV> <DIV>I would suggest that anyone sending meteorite material out for = thin=20 sections let their manufacturers know of their concern about = rusting and=20 request that they be prepared without water. This should help mitigate = any=20 potential rusting problems, with or without cover slides.</DIV> <DIV>Regards,</DIV> <DIV>Frank</DIV> <DIV> </DIV> <DIV> </DIV> <DIV> </DIV></BODY></HTML> ------=_NextPart_000_0046_01C10027.393CE060-- Received on Fri 29 Jun 2001 02:08:20 AM PDT |
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