[meteorite-list] Meteorite Thin Section Crust Photos
From: MARK BOSTICK <thebigcollector_at_meteoritecentral.com>
Date: Thu Apr 22 10:31:15 2004 Message-ID: <BAY4-DAV119sErCdfSO000124cd_at_hotmail.com> ------=_NextPart_001_0038_01C42569.3ACD8DC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello List, I have taken a few thin section photographs showing meteorite crust. This= is not easy for my setup as it pretty much demands that part of the lowe= r light on my microscope is shining at me while I am trying the photo. Th= in Section photos are not easy without this extra light, so I ask you giv= e me some leeway, as I do not have the time at the moment to take better = photographs. (My father is here today and I have been grilling outside, s= o to spend more then 20-30 min. on the photos was not an option). I will note that the following photographs only show common chondrites. O= nly one of my achondrite thin sections shows crust and it is not in a spo= t I can get a good polarized photograph of so I have left it off. It appears to me that the pyroxene, burns away faster then the olivine an= d spots of olivine break through the crust line at times. I do not notice= any difference in desert vanished meteorites, then the thin sections fro= m fall meteorites. With the exception of Tulia A, in with it is not deser= t vanish and instead just weathering. In this case, olivine in the crust = is much harder to notice and has pretty much weathered into the crust. I = have not seen the Tulia A specimen the thin section was made from and thi= s might now be crust at all, but rather natural mineralization. =20 However, I think it is fair to say that meteorite crust looks very much a= like, at least in chondrites. The photographs I have put on my web page, if anyone would like to add mo= re photographs feel free to e-mail them to me (I would prefer optimized i= mages). http://www.meteoritearticles.com/colthinsectioncrust.html Mark Bostick www.meteoritearticles.com ------=_NextPart_001_0038_01C42569.3ACD8DC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <HTML><BODY STYLE=3D"font:10pt verdana; border:none;"><DIV><FONT size=3D2= > <P>Hello List,</P> <P>I have taken a few thin section photographs showi= ng meteorite crust. This is not easy for my setup as it pretty much deman= ds that part of the lower light on my microscope is shining at me while I= am trying the photo. Thin Section photos are not easy without this extra= light, so I ask you give me some leeway, as I do not have the time at th= e moment to take better photographs. (My father is here today and I = have been grilling outside, so to spend more then 20-30 min. on the photo= s was not an option).</P> <P>I will note that the following photographs o= nly show common chondrites. Only one of my achondrite thin sections shows= crust and it is not in a spot I can get a good polarized photograph of s= o I have left it off.</P> <P>It appears to me that the pyroxene, burns aw= ay faster then the olivine and spots of olivine break through the crust l= ine at times. I do not notice any difference in desert vanished meteorite= s, then the thin sections from fall meteorites. With the exception of Tul= ia A, in with it is not desert vanish and instead just weathering. In thi= s case, olivine in the crust is much harder to notice and has pretty much= weathered into the crust. I have not seen the Tulia A specimen the thin = section was made from and this might now be crust at all, but rather natu= ral mineralization. </P> <P>However, I think it is fair to say that meteo= rite crust looks very much alike, at least in chondrites.</P> <P>The phot= ographs I have put on my web page, if anyone would like to add more photo= graphs feel free to e-mail them to me (I would prefer optimized images).<= /P> <P><A href=3D"http://www.meteoritearticles.com/colthinsectioncrust.ht= ml">http://www.meteoritearticles.com/colthinsectioncrust.html</A></P> <P>= Mark Bostick</P> <P>www.meteoritearticles.com</P></FONT></DIV></BODY></HT= ML> ------=_NextPart_001_0038_01C42569.3ACD8DC0-- Received on Sun 18 Apr 2004 06:18:56 PM PDT |
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