[meteorite-list] NWA Window

[tett]

Gary,

400 grit is relatively fine when used in conjunction with meteorites.  In 
most cases, I don't polish past 400 grit as detail is lost when over 
polished.  Starting with 150 grit then 300 and then 400 works great for many 
meteorites.  Use your paper on top of a large think piece of glass with lots 
of alcohol.

Some stones polish in seconds.  I just polished some deep cut marks out of a 
large slice ~65mm x 65mm in about 15 minutes.  Some stones are very hard and 
the only way to get a nice window is to cut.  There are probably some on the 
list who will cut for you for a small fee or sample.

Dark shocked meteorites tend to be very tough to polish.  Ringwoodite which 
results from shock (dark black melt) is very hard and I think I can see some 
in your window.

Hope this helps.

tett


----- Original Message ----- 
From: "Gary K. Foote" <gary at webbers.com>
To: <gary at webbers.com>
Cc: <meteorite-list at meteoritecentral.com>
Sent: Wednesday, February 14, 2007 5:31 PM
Subject: Re: [meteorite-list] NWA Window


> Whoops, that's ;
>
> http://www.meteorite-dealers.com/nwawindow.html
>
> Gary
>
>> Well, I used 400 grit wet and sanded and sanded and sanded and sanded.
>> Got a small window.  Any comments/observations? [other than I need better
>> photo skills - lol]
>>
>> C:\webbers\meteorite-dealers\nwawindow.html
>>
>> Gary
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>
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