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Allargentum
Allargentum on carbonate; size 3.2×2.7×1.4 cm
General
Category	Sulfide mineral
Formula (repeating unit)	Ag1−xSbx
IMA symbol	All
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 , Z = 2
Identification
Color	Silver gray
Mohs scale hardness	4
Luster	Metallic
Diaphaneity	Opaque
Specific gravity	10.0 (meas.), 10.12 (calc.)
References

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_1−xSb_x, 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.

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. ^ Allargentum. Mindat
3. Allargentum. Webmineral

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