Stephanite
Ag5SbS4IMA symbol: Sphgrandfathered
Stephanite is a sulfide or sulfosalt mineral with the formula Ag5SbS4, crystallizing in the orthorhombic system. It has a Mohs hardness of 2-2.5, typically black in color, with a metallic luster, a specific gravity of 6.28. Its streak is black.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | C m c 21 |
| Cell (Å, °) | a = 7.8329, b = 12.458, c = 8.5272; α = 90, β = 90, γ = 90 |
| Cell volume | 832.104 ų, Z = 4 |
| Axial ratios | 0.6287:1:0.6845calculated from COD 9013429 |
| Source structure | COD 9013429 (Mineralogical Magazine, 2009) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.09 | 2.586 | 2.925 | 2.884 | 2.192 | 2.448 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 75.5 | 48.3 | 47.9 | 32.7 | 31.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013429; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.301 g/cm³calculated from COD 9013429 |
|---|---|
| Hardness (Mohs) | 2-2.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.28 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 789.36 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ag 68.33%, Sb 15.43%, S 16.25% |
Classification
| Nickel-Strunz (10th) | 2.GB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.GB.10Wikidata (CC0) |