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 Post subject: GIA photomicrography slide show
PostPosted: Fri Oct 18, 2013 1:33 pm 
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Hi Everyone, GIA has posted a 15 image slide show of photomicrographs taken by John Koivula and I. If interested, you can access the slide show at the following link:
http://www.gia.edu/photomicrography

Nathan

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 Post subject: Re: GIA photomicrography slide show
PostPosted: Fri Oct 18, 2013 7:19 pm 
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Some real beauties there =D> . Love the sword!

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 Post subject: Re: GIA photomicrography slide show
PostPosted: Fri Oct 18, 2013 11:19 pm 
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Hey Nathan, thanks for the link.
Awesome!
Thanks again. 8)


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 Post subject: Re: GIA photomicrography slide show
PostPosted: Sat Oct 19, 2013 4:57 am 
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Very nice shots, thanks for sharing!

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 Post subject: Re: GIA photomicrography slide show
PostPosted: Sat Oct 19, 2013 6:02 am 
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One of the images in the gallery is plato-sandmeier lines in flame fusion corundum.
Somebody could give me a reference to read more about this effect? Why it is called so?
Thanks in advance!

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 Post subject: Re: GIA photomicrography slide show
PostPosted: Sat Oct 19, 2013 7:49 am 
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I just have seen that these lines were described in the Photoatlas Vol 1, p. 478.:

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Viewed parallel to the optic axis in polarized light, the so-called "Sandmeier-Plato" striations, resulting from polysynthetic twinning along the prism of second order (11-20), which can often be observed as a characteristic feature of synthetic "Verneuil corundum".

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 Post subject: Re: GIA photomicrography slide show
PostPosted: Tue Oct 22, 2013 1:27 pm 
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Hi Nathan !

Many Thanks for these wonderful pictures :roll: =D>
The Nature is so beautiful :smt060

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