Mineral Factbook

Troilite

FeSIMA symbol: Trograndfathered

Troilite is a sulfide or sulfosalt mineral with the formula FeS, crystallizing in the hexagonal system. It has a Mohs hardness of 4, typically brown in color, with a vitreous luster, a specific gravity of 4.75-4.82. Its streak is black.

Photos

Troilite specimen photo
Sharygin, V.V.; Ripp, G.S.; Yakovlev, G.A.; Seryotkin, Y.V.; Karmanov, N.S.; Izbrodin, I.A.; Grokhovsky, V.I.; Khromova, E.A. · CC BY 4.0 · Commons
Troilite specimen photo
Galuskin, E.V.; Galuskina, I.O.; Kusz, J.; Książek, M.; Vapnik, Y.; Zieliński, G. · CC BY 4.0 · Commons
Troilite specimen photo
Galuskin, E.V.; Galuskina, I.O.; Kusz, J.; Książek, M.; Vapnik, Y.; Zieliński, G. · CC BY 4.0 · Commons
Troilite specimen photo
Galuskin, E.V.; Galuskina, I.O.; Kusz, J.; Książek, M.; Vapnik, Y.; Zieliński, G. · CC BY 4.0 · Commons

Crystallography

Crystal systemhexagonal crystal systemWikidata (CC0)
Space groupP -6 2 c
Cell (Å, °)a = 5.965, b = 5.965, c = 11.757; α = 90, β = 90, γ = 120
Cell volume362.283 ų, Z = 12
Axial ratios1.0000:1:1.9710calculated from COD 9004034
Source structureCOD 9004034 (American Mineralogist, 2006) — 1 of 6 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.0932.9832.661.7221.9261.118
I/I₀10040.535.530.212.112

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004034; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)4.835 g/cm³calculated from COD 9004034
Hardness (Mohs)
4single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity
4.75-4.82 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892)
Color
brownsingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak
blacksingle sourceDana, System of Mineralogy, 6th ed. (1892)
Luster
vitreoussingle sourceDana's System, 3rd Appendix (1915)

Chemistry (calculated)

Molecular weight87.91 g/molcalculated from the IMA formula
Composition (wt%)Fe 63.53%, S 36.47%

Classification

Nickel-Strunz (10th)2.CC.10Wikidata (CC0)
Nickel-Strunz (9th)2.CC.10Wikidata (CC0)
Dana (8th)2.8.9.1Wikidata (CC0)