Mineralogy Database

Mooihoekite Mineral Data

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General Mooihoekite Information

Help on Chemical  Formula: Chemical Formula: Cu9Fe9S16
Help on Composition: Composition: Molecular Weight = 1,587.59 gm
   Iron    31.66 %  Fe
   Copper  36.02 %  Cu
   Sulfur  32.32 %  S
          100.00 % 
Help on Empirical Formula: Empirical Formula: Cu9Fe2+9S16
Help on Environment: Environment: In massive sulfide from a pipe-shaped dunite pegmatite in the Norite Zone of the Bushveld Complex.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Mooihoek Farm, Lydenberg district, Transvaal, South Africa Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Mooihoekite + Pronunciation Say MOOIHOEKITE
Help on Synonym: Synonym: ICSD 2649
  PDF 25-286

Mooihoekite Image

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Comments: Lighter toned brassy metallic mooihoekite masses in chalcopyrite with magnetite.
Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Haycockite   Mooihoekite

Comments: B&W polished section image of mooihoekite-haycockite intergrowth showing tarnished mooihoekite (mh) and haycockite (hc). The small whitest lamellar grains are mackinawite.
Location: Hortonolite dunite (replacement,) pegmatite, Mooihoek Farm, Lydenburg District, Transvaal, South Africa. (AmMin, v57:689). Scale: See Image.
© American Mineralogist

Mooihoekite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.5076
Help on Cell Dimensions: Cell Dimensions: a = 10.581, c = 5.371, Z = 1; V = 601.32 Den(Calc)= 4.38
Help on Crystal System: Crystal System: Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: P 42m-
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.07(1), 1.89(0.8), 1.6(0.6),

Physical Properties of Mooihoekite

Help on Color: Color: Brass yellow, Dark purple, Pink brown.
Help on Density: Density: 4.36
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Mooihoekite

Help on RL Color: RL Color: Light yellow, tarnishes to pinkish brown and purple.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Mooihoekite in Air
λ R  ∑ R(λ) 
 400 nm   14.30   
 420 nm   16.70 
 440 nm   20.00 
 460 nm   23.90 
 480 nm   27.50 
 500 nm   30.60 
 520 nm   33.20 
 540 nm   35.20 
 560 nm   36.70 
 580 nm   37.80 
 600 nm   38.80 
 620 nm   39.40 
 640 nm   40.00 
 660 nm   40.20 
 680 nm   40.30 
 700 nm   40.40 
Calculated Relative Intensity Colors of Mooihoekite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 410%

Calculated Properties of Mooihoekite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Mooihoekite =4.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0091355452
Boson Index = 0.9908644548
Help on Photoelectric: Photoelectric: PEMooihoekite = 27.49 barns/electron
U=PEMooihoekite x rElectron Density= 113.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mooihoekite is Not Radioactive

Mooihoekite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.08)Talnakhite Group Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m Haycockite Cu4Fe5S8 P 222 2 2 2 Mooihoekite Cu9Fe9S16 P 42m- 4 2m
Help on  Strunz Class: Strunz Class: 02.CB.10b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CB -With Zn, Fe, Cu, Ag, Au, etc
02.CB.10b Haycockite Cu4Fe5S8 P 222 2 2 2
02.CB.10b Mooihoekite Cu9Fe9S16 P 42m- 4 2m
02.CB.10b Putoranite Cu1.1Fe1.2S2 P n3n 4/m 3 2/m
02.CB.10b Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

Other Mooihoekite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Mooihoekite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.CB.10b





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