Empressite
AgTeIMA symbol: Epsredefined
Empressite is a sulfide or sulfosalt mineral with the formula AgTe, crystallizing in the orthorhombic system. It has a Mohs hardness of 3-3.6, a specific gravity of 7.51. Its streak is black or gray.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P m n b |
| Cell (Å, °) | a = 8.882, b = 20.1, c = 4.614; α = 90, β = 90, γ = 90 |
| Cell volume | 823.729 ų, Z = 16 |
| Axial ratios | 0.4419:1:0.2296calculated from COD 9003495 |
| Source structure | COD 9003495 (American Mineralogist, 2004) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.699 | 2.22 | 3.328 | 3.8 | 3.174 | 2.314 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 34.8 | 29.9 | 29.9 | 25.7 | 23.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9003495; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.595 g/cm³calculated from COD 9003495 |
|---|---|
| Hardness (Mohs) | 3-3.6Dana's System, 3rd Appendix (1915) |
| Specific gravity | 7.51 g/cm3corroboratedDana's System, 3rd Appendix (1915) |
| Streak | black, graysingle sourceDana's System, 3rd Appendix (1915) |
Chemistry (calculated)
| Molecular weight | 235.47 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ag 45.81%, Te 54.19% |
Classification
| Nickel-Strunz (10th) | 2.CB.80Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CB.80Wikidata (CC0) |