Manganese Oxide: a chemical compound with the formula MnO₂. It is an odorless solid ranging in color from gray to black, naturally found in Pyrolusite, the primary mineral source of Manganese. It is also present in Manganese nodules on the ocean floor. Widely used in the brick and glass industries, it is the starting material in chemistry for producing potassium permanganate (KMnO₄) and other Manganese compounds.
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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