Allargentum
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]
| 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] |
References
- 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.
- Allargentum. Mindat
- Allargentum. Webmineral
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