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.

Name Pronunciation:

Haycockite + Pronunciation

Synonym:

ICSD 1949

IMA1971-028

PDF 25-289

Haycockite Image

Images:

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

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),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Rowland J F , Hall S R , Acta Crystallographica, Section B , 31 (1975) p.2105-2112, Haycockite, Cu4Fe5S8: a superstructure in the chalcopyrite series, Locality: Lydenburg District, Transvaal, South Africa

Physical Properties of Haycockite

Color:

Brass yellow, Metallic.

Density:

4.35

Diaphaneity:

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:

Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Haycockite =4.35 gm/cc.

Fermion Index:

Fermion Index = 0.0099294535
Boson Index = 0.9900705465

Photoelectric:

PE_Haycockite= 26.90 barns/electron
U=PE_Haycockite x rElectron Density= 110.79 barns/cc.

Radioactivity:

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

Haycockite Classification

Dana Class:

02.09.08.02 (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 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 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Haycockite

Cu4Fe5S8
Dana No: 02.09.08.02 Strunz No: 02.CB.10b
Locality:

Notes: