S SouthernGent Shiny_Rock Joined Dec 5, 2018 Messages 475 Dec 28, 2018 #1 I keep seeing mention that some gemstones are birefringent (is that also double-refractive?). Is that a preferred characteristic or not?
I keep seeing mention that some gemstones are birefringent (is that also double-refractive?). Is that a preferred characteristic or not?
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