Mooihoekite Mineral Data

General Mooihoekite Information

Chemical Formula:

Cu9Fe9S16

Composition:

Molecular Weight = 1,587.59 gm

Iron 31.66 % Fe

Copper 36.02 % Cu

Sulfur 32.32 % S

______

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

PDF 25-286

Mooihoekite Image

Images:

Mooihoekite

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

Images:

Mooihoekite Haycockite

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

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 - ScalenohedralH-M Symbol (4 2m) Space Group: P 4₂m-

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.07(1), 1.89(0.8), 1.6(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Hall S R , Rowland J F , Acta Crystallographica, Section B , 29 (1973) p.2365-2372, The crystal structure of synthetic mooihoekite, Cu9Fe9S16, Locality: synthetic

Physical Properties of Mooihoekite

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

Optical Properties of Mooihoekite

RL Color:

Light yellow, tarnishes to pinkish brown and purple.

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**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	410%
R

Calculated Properties of Mooihoekite

Electron Density:

Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Mooihoekite =4.38 gm/cc.

Fermion Index:

Fermion Index = 0.0091355452
Boson Index = 0.9908644548

Photoelectric:

PE_Mooihoekite= 27.49 barns/electron
U=PE_Mooihoekite x rElectron Density= 113.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mooihoekite is Not Radioactive

Mooihoekite Classification

Dana Class:

02.09.08.03 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.08)Talnakhite Group

02.09.08.01 Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

02.09.08.02 Haycockite Cu4Fe5S8 P 222 2 2 2

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

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

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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Print or Cut-and-Paste your Mooihoekite Specimen Label here :

Mooihoekite

Cu9Fe9S16
Dana No: 02.09.08.03 Strunz No: 02.CB.10b
Locality:

Notes: