Allargentum
Allargentum is a mineral from the class of antimonides, superclass of sulfides and sulfosalts, with formula written as Ag1−xSbx, where x = 0.09–0.16. This moderately rare mineral is found in silver ores and is therefore named from the Greek ἄλλος and the Latin argentum. Its Vickers hardness is 172–203.
