Epidote: a mineral with the chemical formula Ca₂(Fe,Al)Al₂[O,OH,SiO₄,Si₂O₇]. It ranges from transparent to opaque, with a vitreous luster and colors from green to black, yellow, or gray. Epidote crystallizes in the Monoclinic System and occurs in prismatic, short crystals, rarely tabular or pseudo-octahedral. It is found in metamorphic rocks and as an accessory mineral in igneous rocks.
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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