Haycockite Mineral Data

Haycockite Mineral Data +

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General Haycockite Information

Chemical Formula:

Cu4Fe5S8

Composition:

Molecular Weight = 789.95 gm

Iron 35.35 % Fe

Copper 32.18 % Cu

Sulfur 32.47 % S

______

100.00 %

Empirical Formula:

Cu₄Fe²⁺₅S₈

Environment:

In a hortonolite dunite (replacement) pegmatite in the Bushveld Complex.

IMA Status:

Approved IMA 1972

Locality:

Mooihoek Farm, Lydenburg, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Maurice H. Haycock (1900-), Canadian mineralogist.

Synonym:

ICSD 1949

IMA1971-028

PDF 25-289

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Haycockite Crystallography

Axial Ratios:

a:b:c =1:1:2.9467

Cell Dimensions:

a = 10.71, b = 10.71, c = 31.56, Z = 12; V = 3,620.06 Den(Calc)= 4.35

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 222

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

By Intensity(I/I_o): 3.07(1), 1.88(0.8), 1.89(0.6),

Physical Properties of Haycockite

Color:

Brass yellow, Metallic.

Density:

4.35

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Metallic

Streak:

black

Optical Properties of Haycockite

RL Anisotrophism:

Weak to moderate.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Haycockite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	13.90	13.50
420 nm	15.50	15.90
440 nm	18.30	19.40
460 nm	21.70	23.20
480 nm	25.10	26.80
500 nm	28.20	29.90
520 nm	31.00	32.50
540 nm	33.30	34.50
560 nm	35.10	36.10
580 nm	36.60	37.30
600 nm	37.80	38.30
620 nm	38.60	38.90
640 nm	39.20	39.40
660 nm	39.60	39.60
680 nm	39.80	39.70
700 nm	40.00	39.80

**Calculated Relative Intensity Colors of Haycockite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	440%
R₁
R₂

Calculated Properties of Haycockite

Electron Density:

r_electron=4.12 gm/cc
note: r_Haycockite=4.35 gm/cc.

Fermion Index

Fermion Index = 0.00992
Boson Index = 0.99008

Photoelectric:

PE_Haycockite= 26.90 barns/electron
U=PE_Haycockite x r_electron= 110.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Haycockite is Not Radioactive

Haycockite Classification

Dana Class:

2.9.8.2 (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.04-20 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 Haycockite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Haycockite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Haycockite

Cu4Fe5S8
Dana No: 2.9.8.2 Strunz No: II/C.04-20
Locality:

Notes: