Greigite Fe2 +Fe3 +2 S4 IMA symbol: Grg approved
Greigite is a sulfide or sulfosalt mineral with the formula Fe2+Fe3+2S4, crystallizing in the cubic system. It has a calculated density of 4.079 g/cm3.
Crystallography Crystal system cubic crystal systemWikidata (CC0) Space group F d -3 m :2 Cell (Å, °) a = 9.876, b = 9.876, c = 9.876; α = 90, β = 90, γ = 90 Cell volume 963.259 ų, Z = 8 Axial ratios 1.0000:1:1.0000calculated from COD 9000123 Source structure COD 9000123 (American Mineralogist, 1964)
Powder X-ray diffraction (calculated) 2θ (degrees, Cu Kα1) I/I₀ (max 100) d (Å) 2.978 1.746 2.469 1.901 3.492 1.286 I/I₀ 100 87 52 34.5 26.4 18.5
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000123; idealized occupancies, no preferred orientation.
Physical properties Density (calculated) 4.079 g/cm³calculated from COD 9000123
Classification Nickel-Strunz (10th) 2.DA.05Wikidata (CC0) Nickel-Strunz (9th) 2.DA.05Wikidata (CC0) Dana (8th) 2.10.1.10Wikidata (CC0)
