Constituent
- Name
- Mg$_{0.79}$Fe$_{0.21}$S
- IMA name
- Niningerite
- Class
- non-silicate mineral
- Compound type
- sulfide
- Relevance
- main - major
- Arrangement
- single phase
- Mass fraction
- 0.93 $\pm$ 0.03
- Formula
- Mg$_0.79$Fe$_0.21$S
- Chemical formula
- Mg0.79Fe0.21S
- Elemental formula
- (Mg2+)0.79 (Fe2+)0.21 (S2-)
- Isotope mixture type
- terrestrial abundance
- Composition comments
- Mg is the dominant atom compared to Fe and Mn. Common impurities: Ca,Zn,Cr
Strunz
- Class
- sulfides - sufosalts (02)
- Division
- metal sulfides, M:S = 1:1 (and similar) (02.C)
- Family
- With Sn, Pb, Hg, etc. (02.CD)
- Code
- 02.CD.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
- Galena group (Isometric: Fm3m) (02.08.01)
- Code
- 02.08.01.06
- Phase type
- crystalline
- Crystal system
- isometric (cubic)
- Crystal class
- hexoctahedral
- Crystal class symbol
- m-3m (Oh)
- Crystal spacegroup
- Fm-3m
- Molar mass
- 68.90 $g/mol$
- Refringence type
- isotropic
- Refringence sign
- no
- Color
- gray
- Diaphaneity
- opaque
- Luster
- metallic