New Mineral Named After GIA’s John Koivula
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 Post subject: polariscope reaction of polycristalline diamond
PostPosted: Mon May 21, 2012 12:24 pm 
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Polycristalline diamonds can be transluscent (notably the polycrystalline varieties know as boart which is a granular aggregate and ballas which is a fibrous aggregate).
When transluscent, what reaction should be expected under the polariscope?

As I understand it microcrystalline/cryptocrystalline aggregates will appear light all the time throughout a 360° rotation only if the aggregates is made of anisotropic grains.
So as polycrystalline diamonds are polycrystalline aggregates of fine isotropic grains or fibers, I guess it should either appear dark throughout a 360° rotation, or possibly show polarization anomalies, but it should NOT appear light all the time like anisotropic aggregates do. Am I right?


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