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Mooihoekite Mineral Data
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General Mooihoekite Information
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 Chemical Formula: |
Cu9Fe9S16 |
| Composition: |
Molecular Weight = 1,587.59 gm |
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Iron 31.66 % Fe |
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Copper 36.02 % Cu |
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Sulfur 32.32 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu9Fe2+9S16 |
| Environment: |
In massive sulfide from a pipe-shaped dunite pegmatite in the Norite Zone of the Bushveld Complex. |
| IMA Status: |
Approved IMA 1972 |
| Locality: |
Mooihoek Farm, Lydenberg district, Transvaal, South Africa Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Mooihoekite + Pronunciation  |
| Synonym: |
ICSD 2649 |
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PDF 25-286 |
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Mooihoekite Image |
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Images:
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Images:
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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 |
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Mooihoekite Crystallography
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| Axial Ratios: |
a:c = 1:0.5076 |
| Cell Dimensions: |
a = 10.581, c = 5.371, Z = 1; V = 601.32 Den(Calc)= 4.38 |
| Crystal System: |
Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: P 42m- |
| X Ray Diffraction: |
By Intensity(I/Io): 3.07(1), 1.89(0.8), 1.6(0.6), |
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Physical Properties of Mooihoekite
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| Color: |
Brass yellow, Dark purple, Pink brown. |
| Density: |
4.36 |
| Diaphaneity: |
Opaque |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
4 - Fluorite |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Mooihoekite
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| RL Color: |
Light yellow, tarnishes to pinkish brown and purple. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Mooihoekite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
14.30 |
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| 420 nm |
16.70 |
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| 440 nm |
20.00 |
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| 460 nm |
23.90 |
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| 480 nm |
27.50 |
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| 500 nm |
30.60 |
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| 520 nm |
33.20 |
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| 540 nm |
35.20 |
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| 560 nm |
36.70 |
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| 580 nm |
37.80 |
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| 600 nm |
38.80 |
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| 620 nm |
39.40 |
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| 640 nm |
40.00 |
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| 660 nm |
40.20 |
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| 680 nm |
40.30 |
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| 700 nm |
40.40 |
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Calculated Relative Intensity Colors of Mooihoekite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
410% |
| R |
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Calculated Properties of Mooihoekite
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| Electron Density: |
Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Mooihoekite =4.38 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0091355452
Boson Index = 0.9908644548 |
| Photoelectric: |
PEMooihoekite = 27.49 barns/electron
U=PEMooihoekite x rElectron Density= 113.92 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mooihoekite is Not Radioactive |
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Mooihoekite Classification
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| Dana Class: |
02.09.08.03 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.08)Talnakhite Group |
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02.09.08.01 Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m |
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02.09.08.02 Haycockite Cu4Fe5S8 P 222 2 2 2 |
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02.09.08.03 Mooihoekite Cu9Fe9S16 P 42m- 4 2m |
| Strunz Class: |
02.CB.10b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.10b Haycockite Cu4Fe5S8 P 222 2 2 2 |
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02.CB.10b Mooihoekite Cu9Fe9S16 P 42m- 4 2m |
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02.CB.10b Putoranite Cu1.1Fe1.2S2 P n3n 4/m 3 2/m |
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02.CB.10b Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m |
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Other Mooihoekite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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Mooihoekite
Cu9Fe9S16
Dana No: 02.09.08.03 Strunz No: 02.CB.10b
Locality:
Notes:
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