Mineral phase
IMA name
Troilite
Class
non-silicate mineral
Compound type
sulfide
Comments
species related to the Pyrrhotite: no vacancy endmember (non-magnetic)
Formula
$FeS$
Chemical formula
FeS
Elemental formula
Fe S
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Fe$ Iron element 1 constituent element main
$S$ Sulfur element 1 constituent element main

Strunz

Class
sulfides - sufosalts (02)
Division
metal sulfides, M:S = 1:1 (and similar) (02.C)
Family
With Ni, Fe, Co, PGE, etc. (02.CC)
Code
02.CC.10

Dana

Major class
sulfides (II)
Class
sulfides - including selenides and tellurides (02)
Type
where Am Bn Xp, with m:p=1:1 (02.08)
Group
Troilite group (02.08.09)
Code
02.08.09.01
Phase type
crystalline
Crystal system
hexagonal
Crystal class
dihexagonal-dipyramidal
Crystal class symbol
6/mmm (D6h)
Crystal spacegroup
P6(3)/mmc
Molar mass
87.91 $g/mol$
Density
4.58 - 4.65 $g/cm^3$
State NTP
solid
Refringence type
unknown
Refringence sign
unknown
Pure color
brown
Color
bronze brown, gray brown, yellow brown
Diaphaneity
opaque
Luster
metallic