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 Post subject: Watch Crystal ID.
PostPosted: Sun May 06, 2012 12:32 pm 
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Joined: Sat Feb 11, 2012 8:19 pm
Posts: 24
Hi:
This might not be the right forum, but here it goes.

I have a 2 watch crystals that I am trying to id.
The RI I am getting is 1.51-1.52 on them. I swear one was a syn sapphire crystal or at-least a coating.
One is whitish yellow under SW and inert under LW. The other is inert under both.

I know some crystals have a coating, but I thought I would toss it out here to see if anyone has experience in identifying face crystals on watches.

Usually it's either glass, plastic, quartz or syn sapphire or some type of coating on them.
It's not a big deal, just thought I would ask if anyone else ever got that kind of RI reading.

Thank you,
David


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 Post subject: Re: Watch Crystal ID.
PostPosted: Sat May 12, 2012 7:46 pm 
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Joined: Tue Jan 02, 2007 8:20 pm
Posts: 2659
What they call quartz, may be fused silica, which for one thing, is amorphous like glass (it is a glass). So there are a variety of RIs you could get on it and it would not show birefringence nor flash in the polariscope.

Reaction to UV would depend on impurities present in the melt.


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