Goethite: a mineral chemically classified as an Iron Hydroxide with the formula FeO(OH). It ranges from translucent to opaque, exhibiting adamantine, silky, or dull luster, and its color varies from brown to yellowish to black. It crystallizes in the Orthorhombic System and occurs as small prismatic or acicular crystals, as well as in powdery, massive, or fibrous-radiated aggregates.
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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