An esmeralda iyo an gapong alahas asin an baryedad kan mineral beryl (Be3Al2(SiO3)6) kolor berde na igwa nin gira nin chromium o kun minsan vanadium.[1] An beryl igwa nin katagasan nin 7.5–8 sa Mohs scale.[1] An kadaklan kan esmeralda igwa nin dakol na materyal na naluom sa laog durante kan pormasyon kan mahalagang gapo,[2] kaya baga an saindang katagasan (resistance to breakage) pigklasipikar bilang maluya sa pangkagabsan. An esmeralda iyo an sarong cyclosilicate.
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