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Showing posts with label Thin Sections. Show all posts
Showing posts with label Thin Sections. Show all posts

Monday, 29 November 2004

An Opportunity For Public Service, Profit, and Publicity

An Opportunity For Public Service, Profit, and Publicity

Paul H bristolia at yahoo.com
Sun Nov 28 20:10:52 EST 2004

While looking around on the Internet, I
found an opportunitye for the meteorite
community to do a public service and, at
the same time possibly profit for their
contributions.

This ooportunity exists at the "Earth
Science World ImageBank" at:

http://www.earthscienceworld.org/imagebank/

"The Earth Science World ImageBank is a
service provided by the American Geological
Institute (AGI). This ImageBank is designed
to provide quality geoscience images to the
public, educators, and the geoscience
community."

First, the meteorite community could do a
public service by submitting representative
pictures of meteorites, tektites, impactites,
impact craters, meteorite thin sections,
and anything else related to meteorites. As
far as I found this database has only one
picture of a meteorite and no images of
tektites. It would certainly would be a
public service to contribute pictures of
meteorites and related items, which can be
used for educational purposes. I am using
the word "contribute" because the person
submitting the pictures still retains
copyright on it and can still require a
fee for any commercial use.

It would be a public service if a collection
of meteorite photographs could be submitted
to this web site that included an example
of each different type of meteorite and a
selection of pictures of historically
important falls. Also, pictures of craters,
meteorites as they are found in the field,
impactites, shocked belenmites, shocked
quartz, etc. would be an important
contribution.

Second, one feature of the image data bank
is that a person can permit the free use
of their images for specific educational
purposes and, yet, require people, who want
to use an image for commercial purposes,
pay them a set fee for each use of one of
their images. Thus, not only can a person
perform a public service by providing
images of meteorites, impact craters,
impactites, tektites, thin sections, and
so forth, they also can profit from an
image in the database, if someone wants
to use it for commercial purposes.

Finally, the people on this list should
note that the name of the person or company
hdoling teh copyright is displayed in the
database. This gives them some free publicity.
Also, if an image is used for educational
purposes, the database requests that the
proper credit be given to it. Again, the
contributors will get some more free
publicity whenever their image is used.

For details of how to contribute, go to:

http://www.earthscienceworld.org/imagebank/submit/index.html

"The Earth Science World ImageBank is
always looking to collect more high-
quality geoscience images for this
growing collection. The primary mission
of the ESWIB is to provide these images
to educators, the geoscience community,
and the public for non-commercial use.
Your contribution and assistance in
helping us develop this lasting resource
will not only benefit the scientific
community, but also help to enhance
Earth System education."

Best Regards,

Paul
Baton Rouge, LA

Thursday, 27 May 2004

what is the world standards for petrographical preparations (polarization microscopy)

what is the world standards for petrographical preparations (polarization microscopy)

Paul H bristolia at yahoo.com
Thu May 27 20:44:16 EDT 2004

E. L. Jones jonee at epix.net wrote:


>I am also interested in the use of "quartz"

>as index markers. This isn't in any of my

>reference books. Are they attached to the

>specimen and ground at the same time as the

>thin section?


No. The person grinding the thin section uses
the bifringence of whatever minerals are
present to judge the thickness of the thin
section. Quartz is used as an index marker
simply because, it is so common as to be
present in most sedimentary, igneous, and
metamorphic rocks. When it isn't present,
a person uses whatever mineral happens to
be in the thin section as an index.

Some web pages are:

Making Petrographic Thin Sections
http://www.union.edu/PUBLIC/GEODEPT/COURSES/petrology/thinsections.htm
http://almandine.geol.wwu.edu/~dave/other/thinsections/
http://www.lpl.arizona.edu/~rhill/fossil/thnsect.html

Making Petrographic Thin Sections
http://www.uni-wuerzburg.de/mineralogie/links/tools/making.html

Rock-Forming Minerals in Thin Section
http://www.uwgb.edu/dutchs/petrolgy/thinsect.htm

Atlas of Rocks and Minerals Under the Microscope
http://www.geologynet.com/thins.htm

Igneous rocks in thin section
http://www.union.edu/PUBLIC/GEODEPT/COURSES/petrology/ig_minerals.htm

Minerals in thin sections
http://www.uni-wuerzburg.de/mineralogie/links/petrology/thinsection.html


>Another question I have. Is there a house

>that specializes in preparation? Kinda of

>like the $2 a carat faceting deals one can

>get in Thailand?


There are many places that specialize in making
thin sections. Typically, a person gets what
they pay for. A quick search using Google will
find a number petrographic labs that make thin
sections. If you are going to pay 5 to 50 dollars
a gram for a meteorite, paying 15.00 dollars for
a high quality thin section is the least of
your costs.

The people that use to make the thin sections for
my research (and search for more shocked quartz)
from samples in the Brushy Creek Carter is:

National Petrographic Service, Inc.
5933 Bellaire Blvd., Suite 108
Houston, TX 77081
http://www.nationalpetrographic.com/

Their price list is at:
http://www.nationalpetrographic.com/thin_sections.htm

Their price are average for what thin sections cost.

Elton


>Roman Davidov wrote:

>>Dear list members. Hello.

>>My question is: What is the world standards for

>>petrographical preparations. If I'm not mistaken

>>in English it sounds like "THIN SECTIONS".


Yes, as noted above, the term is "thin section".


>To be more concrete I mean: form and sizes of

>object glass (width,height,thickness);


The glass slide of the standard thin section is
27 x 46mm (1" x 1 7/8"). Larger slides are produced,
but size might vary according to the lab that
prepares them. For example, National Petrographic
has 38 x 75mm (1.5" x 3") and 50 x 75mm (2" x 3")
size glass slides for larger size thin sections.


>type of optical glue (we are using composition

>named "Canadian Balsam");


Hillquist A-B is used to glue slabs to slides.
However, Canadium Balsam is the standard for
attaching the coverslip. If you want to do any
microprobe, etxching, or similar work, i.e. for
identifying shocked quartz, the thin section needs
to be finished by polishing and the coverslip
left off.


>linear sizes of object (I'm sure that thickness

>is one to all of the world - 0.003 millimeters);

>form and sizes of cover glass.


The only requirement for the size of the object
is that it is a few mm smaller than the size of
the glass slide being used. The coverslip is
larger than the specimen and smaller than
the slide.

The coverslips come in sizes, thicknesses, and
optical character that are standardized for use
in making thin sections. A person needs to talk
with the people supplying the coverslips and
get the technical specifications of what they
are selling to see if they are suitable for
thin sections.

...text deleted...

Yours,

Paul
Baton Rouge, LA