Allargentum is a mineral from the class of antimonides, superclass of sulfides and sulfosalts (sometimes ascribed to the natural elements and alloys class), with formula written as Ag<sub>1âÂÂx</sub>Sb<sub>x</sub>, where x = 0.09âÂÂ0.16. This moderately rare mineral is found in silver ores and is therefore named from the Greek á¼Âûûÿà(allos, "another") and the Latin argentum ("silver"). Its Vickers hardness is 172âÂÂ203.