Stannite
Cu2FeSnS4IMA symbol: Stngrandfathered
Stannite is a sulfide or sulfosalt mineral with the formula Cu2FeSnS4, crystallizing in the tetragonal system. It has a Mohs hardness of 4, typically black, gray or yellow in color, with a metallic luster, a specific gravity of 4. Its streak is black.
Photos
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | I -4 2 m |
| Cell (Å, °) | a = 5.4495, b = 5.4495, c = 10.726; α = 90, β = 90, γ = 90 |
| Cell volume | 318.531 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.9683calculated from COD 9004745 |
| Source structure | COD 9004745 (The Canadian Mineralogist, 2003) — 1 of 6 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.129 | 1.911 | 1.641 | 1.927 | 1.622 | 1.109 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 39.1 | 28 | 20.1 | 13.4 | 13 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004745; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.482 g/cm³calculated from COD 9004745 |
|---|---|
| Hardness (Mohs) | 4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, gray, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceWikidata (CC0) blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 429.91 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 29.56%, Fe 12.99%, Sn 27.61%, S 29.83% |
Classification
| Nickel-Strunz (10th) | 2.CB.15aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CB.15aWikidata (CC0) |