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Troilite [abbr. Tro ]

Year of discovery: 1863 (Albareto meteorite, Italy), 1965 (Japan)

Locality list: 9 localities of troilite

• FeS
• [Fe²⁺][S]^2-

• Class: Sulfide
• Magnetism: Antiferromagnetic
• Possibly a polytype of Pyrrhotite

• Polymorph: Rudashevskyite (Cubic)

• Fe => (Fe,Ni): Smythite
• Fe => Fe_0.88: Pyrrhotite

• Fe => Hg: Metacinnabar (α), Cinnabar, Hypercinnabar
• Fe => Zn: Sphalerite (α), Wurtzite (β)
• Fe => Cu: Covellite
• Fe => Mn: Alabandite (α), Rambergite (β)
• Fe => Ni: Millerite (β)
• Fe => Cd: Hawleyite (α), Greenockite (β)

• Color: Grayish brown
• Tarnish: Yellowish brown
• Streak: Brownish black
• Luster: Metallic
• Diaphaneity: Opaque

• Aggregate: Massive, Nodular

• Cleavage: No
• Hardness: 3.5-4
• Density: 4.6

• System: Hexagonal
• Group: 6/m2/m2/m, P6₃/mmc
• Lattice: a=6.0, c=11.7

Etymology: Dominico Troili, Italian mineralogist who discovered this mineral in a meteorite fell in Albareto, Italy.