Mineral phase
IMA name
Pyrrhotite-4M
Secondary names
Pyrrhotite-4C
Type
Class
non-silicate mineral
Compound type
sulfide
Comments
Clinopyrrhotite, magnetic
Chemical composition
Formula
$Fe_7S_8$
Chemical formula
Fe7S8
Elemental formula
Fe7 S8
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Fe$ Iron element 7 constituent element main
$S$ Sulfur element 8 constituent element main
Composition comments
Pyrrhotite with 1-x=0.875 - Common impurities: Ni, Co, Cu

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
-Pyrrhotite- group (02.08.10)
Code
02.08.10.01
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
C2/c
Molar mass
647.435 $g/mol$
Density
4.58 - 4.65 $g/cm^3$
State NTP
solid
Refringence type
unknown
Refringence sign
unknown
Pure color
brown
Color
bronze, bronze red, dark brown
Diaphaneity
opaque
Luster
metallic
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