Allargentum
Appearance
Allargentum | |
---|---|
![]() Allargentum on carbonate; size 3.2×2.7×1.4 cm | |
General | |
Category | Sulfide mineral |
Formula (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] |
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]
References
[edit]- ^ 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.
- ^ a b Allargentum. Mindat
- ^ Allargentum. Webmineral