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 Post subject: London Dichroscope
PostPosted: Tue Apr 09, 2013 1:12 pm 
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Joined: Tue Apr 17, 2012 1:39 pm
Posts: 20
Good evening dear friends

can anyone tell me with london dichroscope what i can check or
what i can identify ?
Thanks n Regards

Irfan


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 Post subject: Re: London Dichroscope
PostPosted: Tue Apr 09, 2013 1:59 pm 
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Joined: Mon May 14, 2007 11:00 am
Posts: 1133
Location: Monterey, CA
fragile_heart wrote:
can anyone tell me with london dichroscope what i can check or
what i can identifly ?

Lots of things. Get the book "Guide to Affordable Gemology" and all will be explained in detail.


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 Post subject: Re: London Dichroscope
PostPosted: Tue Apr 09, 2013 5:12 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Hi and welcome.
You might want to check our page on the dicroscope in the Gemology Project:
http://www.gemologyproject.com/wiki/ind ... ichroscope
A dichroscope is predominately used to check for pleochroism.
Pleochroism is a characteristic observed in colored anistropic (double refractive) gemstones.

Here is a tutorial by Starla Turner, GG, FGA on the use of a dicroscope. :D


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 Post subject: Re: London Dichroscope
PostPosted: Wed Apr 10, 2013 3:19 pm 
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Joined: Sat May 21, 2011 7:09 am
Posts: 77
Location: Italy
Hi Irfan,

I like London dichroscope, it is easy to use: I made some for my friends, using polarized film removed from broken LCD screen.

As described in previous post, it is used to detect pleochroism of gems/minerals.
Spot the gem (under sun or artificial light) and observe with the dichroscope near the gem. Rotate the gem for better color difference.
Alexandrite, Andalusite, Tourmaline, Tanzanite, Iolite, and more are amazing.

In the same way, with the dichroscope, you will be able to detect the optical axis.


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 Post subject: Re: London Dichroscope
PostPosted: Thu Apr 11, 2013 11:35 am 
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Joined: Tue Apr 17, 2012 1:39 pm
Posts: 20
Barbra Voltaire wrote:
Hi and welcome.
You might want to check our page on the dicroscope in the Gemology Project:
http://www.gemologyproject.com/wiki/ind ... ichroscope
A dichroscope is predominately used to check for pleochroism.
Pleochroism is a characteristic observed in colored anistropic (double refractive) gemstones.

Here is a tutorial by Starla Turner, GG, FGA on the use of a dicroscope. :D


Thank you very much all of you .


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