Radiolarians: protozoa characterized by a siliceous skeleton which, after consolidation, give rise to white, hard sedimentary rocks known as radiolarites.
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Radiolarians: protozoa characterized by a siliceous skeleton which, after consolidation, give rise to white, hard sedimentary rocks known as radiolarites.
back to the gemological glossary
IGR (Rivista Italiana di Gemmologia/Italian Gemological Review) è la rivista gemmologica internazionale italiana, nata nel 2016 da Gem-Tech con l’obiettivo di sviluppare in Italia un network informativo per Gemmologi e per professionisti quotidianamente impegnati nel settore delle pietre preziose.
IGR – Rivista Italiana di Gemmologia, the Italian Gemological Review, is the leading International Gemological Magazine in Italy masterminded by Gem-Tech Gemological Institute, a broad information framework for Gemologists as well as professionals involved daily in the gemstone business.
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