Allargentum
(repeating unit)Ag1−xSbx IMA symbol All[1] Strunz classification 2.AA.30 Dana classification 02.02.01.02 Crystal system Hexagonal Crystal class Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m) Space group P63/mmc Unit cell a = 2.945, c = 4.77 [Å], Z = 2 Identification Color Silver gray Mohs scale hardness 4 Luster Metallic Diaphaneity Opaque Specific gravity 10.0 (meas.), 10.12 (calc.) References [2][3]
H-M symbol: (6/m 2/m 2/m)
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 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 (allos, "another") and the Latin argentum ("silver"). Its Vickers hardness is 172–203.[2]
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