Mackinawite
(Fe,Ni)1+xS (x = 0-0.07)IMA symbol: Mkwapproved
Mackinawite is a sulfide or sulfosalt mineral with the formula (Fe,Ni)1+xS (x = 0-0.07), crystallizing in the tetragonal system. It has a Mohs hardness of 2.5, a calculated density of 4.299 g/cm3. Its streak is black.
Photos
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 4/n m m :1 |
| Cell (Å, °) | a = 3.6735, b = 3.6735, c = 5.0328; α = 90, β = 90, γ = 90 |
| Cell volume | 67.916 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.3700calculated from COD 9011800 |
| Source structure | COD 9011800 (Mineralogical Magazine, 1995) |
Powder X-ray diffraction (calculated)
| d (Å) | 5.033 | 2.308 | 1.807 | 2.967 | 1.837 | 1.725 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 58.1 | 57.4 | 36.1 | 30.5 | 19.3 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011800; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.299 g/cm³calculated from COD 9011800 |
|---|---|
| Hardness (Mohs) | 2.5single sourceWikidata (CC0) |
| Streak | blacksingle sourceWikidata (CC0) |
Classification
| Nickel-Strunz (10th) | 2.CC.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CC.25Wikidata (CC0) |