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Old 17-09-2015, 08:39 AM
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Shiraz (Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,918
maybe you could optically test the flat elements to find their refractive index? - I think that fluorite has a different refractive index to most glasses, so it should be possible to determine what your elements are made of with reasonable confidence.
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