Allargentum

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Allargentum
Allargentum-d32a.jpg
Allargentum on carbonate; size 3.2×2.7×1.4 cm
General
Category Sulfide mineral
Formula
(repeating unit)
Ag1-xSbx
Strunz classification 2.AA.30
Dana classification 02.02.01.02
Crystal system Hexagonal
Dihexagonal dipyramidal class
Unit cell a = 2.945, c = 4.77 [Å], Z = 2
Identification
Color Silver gray
Crystal symmetry Hexagonal
H-M symbol: (6/m 2/m 2/m)
Space group: P63/mmc
Mohs scale hardness 4
Luster Metallic
Diaphaneity Opaque
Specific gravity 10.0 (meas.), 10.12 (calc.)
References [1][2]

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.[1]

References[edit]

  1. ^ a b Allargentum. Mindat
  2. ^ Allargentum. Webmineral