[meteorite-list] How to cut "thin sections"

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From: meteorite1.com <capricorn89_at_meteoritecentral.com>
Date: Thu Apr 22 09:52:14 2004
Message-ID: <000c01c2448b$98cb5300$df36b2d1_at_earthlink.net>

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Hello Mark,

Go to Jim Tobin's article on Making Thin Sections in the current issue =
of the on-line meteorite magazine, the Meteorite Times:
http://www.meteoritetimes.com/ Click on the link "Jim's Fragments"

The color you see are produced by passing light through two crossed =
polarizing filters with a very thin-cut slice (0.03 mm) thick between =
them. How this works is explained in Richard Norton's series (see the =
current issue of METEORITE magazine) for Aug. 2002. =
http://www.meteor.co.nz/

Making thin sections is a detailed process; to do it properly one has =
to be sure the section is UNIFORMLY thick over the entire piece, and =
that the thickness remains constant. This is done by checking what is =
called birefringence as light passes through the polarizers and the thin =
slice. Different minerals will show up as different colors, and these =
change by rotating the polarizers relative to each other. Usually the =
birefringence of light through olivine grains is used to check for =
proper thickness in determining the proper thickness of the =
thin-section.

The two articles, the first on how you may learn to make them yourself, =
and the latter on the theory behind it, should give you the necessary =
background to see how it all works.

Ron Hartman
Ron
R. N. Hartman
METEORITES and MEMBRANE SUSPENSION BOXES

rnh_at_meteorite1.com
www.meteorite1.com

order_at_membranebox.com
www.membranebox.com

Mailing address:
The R. N. Hartman Collection METEORITES
P.O. Box 94
Walnut, CA 91788-0094 (U.S.)

----- Original Message -----=20
From: Morawski, Mark <Mark_Morawski_at_fwc.com>
To: Meteorite-List_at_Meteoritecentral. Com =
<meteorite-list_at_meteoritecentral.com>
Sent: Thursday, August 15, 2002 5:23 AM
Subject: [meteorite-list] How to cut "thin sections"

Good Morning list.

I am a beginning collector, and am wondering what is the technique for =
cutting the beautiful thin sections sometimes seen on EBay, I have a =
fair bit of lapidary equipment, but rather than trial and error, if =
there is a "proven methodology" I would appreciate it.

Thanks

-Mark-

______________________________________________
Meteorite-list mailing list
Meteorite-list_at_meteoritecentral.com
http://www.pairlist.net/mailman/listinfo/meteorite-list

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<BODY>
<DIV><FONT size=3D2>Hello Mark,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Go to Jim Tobin's article on Making Thin Sections in =
the=20
current issue of the on-line meteorite magazine, the Meteorite=20
Times:</FONT></DIV>
<DIV><FONT size=3D2><A=20
href=3D"http://www.meteoritetimes.com/">http://www.meteoritetimes.com/</A=
>  =20
Click on the link "Jim's Fragments"</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>The color you see are produced by passing light =
through two=20
crossed polarizing filters with a very thin-cut slice (0.03 mm) thick =
between=20
them.  How this works is explained in Richard Norton's series (see =
the=20
current issue of METEORITE magazine) for Aug. 2002.  <A=20
href=3D"http://www.meteor.co.nz/">http://www.meteor.co.nz/</A></FONT></DI=
V>
<DIV> </DIV>
<DIV><FONT size=3D2>Making thin sections is a detailed process;  to =
do it=20
properly one has to be sure the section is UNIFORMLY thick over the =
entire=20
piece, and that the thickness remains constant.  This is done by =
checking=20
what is called birefringence as light passes through the =
polarizers=20
and the thin slice.  Different minerals will show up as different =
colors,=20
and these change by rotating the polarizers relative to each =
other. =20
Usually the birefringence of light through olivine grains is used to =
check for=20
proper thickness in determining the proper thickness of the=20
thin-section.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>The two articles, the first on how you may learn to =
make them=20
yourself, and the latter on the theory behind it, should give you the =
necessary=20
background to see how it all works.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Ron Hartman</FONT></DIV>
<DIV>
<P><B><FONT face=3D"Lucida Handwriting" size=3D4>Ron<BR></FONT></B><FONT =
face=3DArial=20
size=3D1>R. N. Hartman<BR>METEORITES and MEMBRANE SUSPENSION =
BOXES</FONT></P>
<P><A href=3D"mailto:rnh_at_meteorite1.com"><FONT face=3DArial=20
size=3D1>rnh_at_meteorite1.com<BR>www.meteorite1.com</FONT></A></P>
<P><FONT face=3DArial size=3D1><A=20
href=3D"mailto:order_at_membranebox.coom">order@membranebox.com<BR></A><A=20
href=3D"http://www.membramebox.com">www.membranebox.com</A></FONT></P>
<P><FONT face=3DArial size=3D1>Mailing address:<BR>The R. N. Hartman =
Collection=20
METEORITES<BR>P.O. Box 94<BR>Walnut, CA 91788-0094 =
(U.S.)</FONT></P></DIV>
<DIV><FONT size=3D2>----- Original Message ----- </FONT>
<DIV><FONT size=3D2>From: Morawski, Mark <<A=20
href=3D"mailto:Mark_Morawski_at_fwc.com">Mark_Morawski@fwc.com</A>></FONT=
></DIV>
<DIV><FONT size=3D2>To: Meteorite-List_at_Meteoritecentral. Com <<A=20
href=3D"mailto:meteorite-list_at_meteoritecentral.com">meteorite-list@meteor=
itecentral.com</A>></FONT></DIV>
<DIV><FONT size=3D2>Sent: Thursday, August 15, 2002 5:23 AM</FONT></DIV>
<DIV><FONT size=3D2>Subject: [meteorite-list] How to cut "thin=20
sections"</FONT></DIV></DIV>
<DIV><BR></DIV><BR><FONT size=3D2>Good Morning list.<BR><BR>I am a =
beginning=20
collector, and am wondering what is the technique for cutting the =
beautiful thin=20
sections sometimes seen on EBay, I have a fair bit of lapidary =
equipment, but=20
rather than trial and error, if there is a "proven methodology" I would=20
appreciate=20
it.<BR><BR>Thanks<BR><BR>-Mark-<BR><BR>__________________________________=
____________<BR>Meteorite-list=20
mailing list<BR><A=20
href=3D"mailto:Meteorite-list_at_meteoritecentral.com">Meteorite-list@meteor=
itecentral.com</A><BR><A=20
href=3D"http://www.pairlist.net/mailman/listinfo/meteorite-list">http://w=
ww.pairlist.net/mailman/listinfo/meteorite-list</A><BR></FONT></BODY></HT=
ML>

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Received on Thu 15 Aug 2002 02:43:04 PM PDT

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