Hi,
Just tested out the download method that was suggested to me....it does
seem to work from the link...but I apologise for the method and all the
ads you are subjected to...I was unaware they might be that bad when
someone showed me the site.
Regards
Graham
ensoramanda wrote:
Hi all,
Over the years I have always enjoyed all the images people have posted
showing meteorites in many ways, beautiful photographs, thin sections
etc etc. I wish to share some images and data of another kind showing
meteorites in another light.
Yesterday I helped my local University with their open day by setting
up a display of some of my meteorite collection and talking to
students and on local radio. In the afternoon I was let loose in their
labs where we cut a couple of meteorites, a NWA 4576 mesosiderite and
an unclassified piece (ordinary chondrite). A great feeling being the
first to see the inside of a meteorite since it was formed.
Then I was shown how to use their SEM (scanning electron microscope)
and left to collect data from my samples....a fantastic priviledge to
be allowed to scan around my own pieces like that. I ended up with
nearly 40 images and related graphs showing the elemental compositions
of various parts.
For those not familiar with an SEM, the samples are loaded into a
vaccum chamber and you then drive the samples around on the computer
screen looking for unusual areas to point the cursor at. Once the
areas or points are chosen the SEM can then almost instantly give you
a graph showing the elements and their percentages...from which a
trained eye can work out the minerals present.
Not being trained in any way to do this then this where I lack the
knowledge to interperate the data...although I can take a good guess
at which is likely to show olivine, troilite. The lighter areas of the
images are the nickel iron.
If anyone on the list has had experince interpereting this sort of
data I would be interested in your comments on what some of the data
shows. For others on the list it might just be an opportunity to look
at some images of meteorites in another way.
So feel free to download the word document (nearly 7 meg) and have a
look if you wish.
http://www.gigasize.com/get.php?d=pz9y3b013tb
(I hope this link works)
The first 7 pages are sample 1, the chondrite, and the rest are NWA
4576...which seems to be the most interesting.
The 2 pages of percentages show 2 areas of Nickel Iron which I guess
may be Taenite and Kamacite due to the different nickel to iron ratios.
I am intrigued by the areas showing carbon dots and the areas with
chlorine and iron and oxygen which I presume are due to weathering?
I will take some photographs of the samples as cut if anyone would
like to see the slices and end cuts.
Graham Ensor, Nr Barwell, UK
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[email protected]
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