Allargentum

From Wikipedia, the free encyclopedia
Jump to: navigation, search
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 02.AA.30
Dana classification 02.02.01.02
Crystal symmetry Hexagonal – dihexagonal dipyramidal, H-M symbol (6/m 2/m 2/m), space group P63/mmc
Unit cell a = 2.945 Å, 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 [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 άλλος ("allos", another) and the Latin 'argentum' (silver). Its Vickers hardness is 172–203.[1]

References[edit]

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