For practising gemologists only. Neodymium pentaphosphate is a rare experimental synthetic material that shows reversible lamellar twinning under polarized light when gentle pressure is applied perpendicular to twinning planes. Take a look.
Useful link:
https://www.gia.edu/gems-gemology/spring-2020-microworld-reversible-twinning-ndp
P.J.Joseph's Weblog On Colored Stones, Diamonds, Gem Identification, Synthetics, Treatments, Imitations, Pearls, Organic Gems, Gem And Jewelry Enterprises, Gem Markets, Watches, Gem History, Books, Comics, Cryptocurrency, Designs, Films, Flowers, Wine, Tea, Coffee, Chocolate, Graphic Novels, New Business Models, Technology, Artificial Intelligence, Robotics, Energy, Education, Environment, Music, Art, Commodities, Travel, Photography, Antiques, Random Thoughts, and Things He Like.
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