Serpentinite: a metamorphic rock, green in color, composed mainly of minerals from the Serpentine Group, specifically Chrysotile and Antigorite. Secondary components include Olivine, Pyroxenes, Garnet, Amphibole, Chromite, and Magnetite. Calcite is often present. Formed through regional metamorphism of ultrabasic magmatites, it has a massive structure that is sometimes foliated or fibrous.
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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