Mooihoekite Mineral Data

Mooihoekite Mineral Data +

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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.

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

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),

Physical Properties of Mooihoekite

Color:

Brass yellow, Dark purple, Pink brown.

Density:

4.36

Diaphaniety:

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:

r_electron=4.14 gm/cc
note: r_Mooihoekite=4.38 gm/cc.

Fermion Index

Fermion Index = 0.00913
Boson Index = 0.99087

Photoelectric:

PE_Mooihoekite= 27.49 barns/electron
U=PE_Mooihoekite x r_electron= 113.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mooihoekite is Not Radioactive

Mooihoekite Classification

Dana Class:

2.9.8.3 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.8)Dana Group

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

2.9.8.2 Haycockite Cu4Fe5S8 P 222 2 2 2

2.9.8.3 Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

Strunz Class:

II/C.04-10 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.04 - Chalcopyrite group, Mooihoekite - Orickite series

II/C.04-10 Mooihoekite Cu9Fe9S16 P 4₂m- 4 2m

II/C.04-20 Haycockite Cu4Fe5S8 P 222 2 2 2

II/C.04-30 Putoranite Cu1.1Fe1.2S2 P n3n 4/m 3 2/m

II/C.04-35 Isochalcopyrite* Cu8Fe9S16 Unk Cubic

II/C.04-40 Talnakhite Cu9(Fe,Ni)8S16 I 43m 4 3m

II/C.04-50 Isocubanite CuFe2S3 F m3m 4/m 3 2/m

II/C.04-60 Orickite CuFeS2·(H2O) Unk Hex

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Mooihoekite

Cu9Fe9S16
Dana No: 2.9.8.3 Strunz No: II/C.04-10
Locality:

Notes: