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Haycockite Mineral Data
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General Haycockite Information
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 Chemical Formula: |
Cu4Fe5S8 |
| Composition: |
Molecular Weight = 789.95 gm |
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Iron 35.35 % Fe |
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Copper 32.18 % Cu |
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Sulfur 32.47 % S |
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______ |
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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 |
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IMA1971-028 |
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PDF 25-289 |
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Haycockite Image |
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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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Haycockite Crystallography
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| 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 - Disphenoidal H-M Symbol (2 2 2) Space Group: P 222 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.07(1), 1.88(0.8), 1.89(0.6), |
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Physical Properties of Haycockite
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| 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 |
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Optical Properties of Haycockite
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| RL Anisotrophism: |
Weak to moderate. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Haycockite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
13.90 |
13.50 |
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| 420 nm |
15.50 |
15.90 |
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| 440 nm |
18.30 |
19.40 |
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| 460 nm |
21.70 |
23.20 |
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| 480 nm |
25.10 |
26.80 |
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| 500 nm |
28.20 |
29.90 |
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| 520 nm |
31.00 |
32.50 |
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| 540 nm |
33.30 |
34.50 |
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| 560 nm |
35.10 |
36.10 |
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| 580 nm |
36.60 |
37.30 |
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| 600 nm |
37.80 |
38.30 |
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| 620 nm |
38.60 |
38.90 |
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| 640 nm |
39.20 |
39.40 |
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| 660 nm |
39.60 |
39.60 |
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| 680 nm |
39.80 |
39.70 |
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| 700 nm |
40.00 |
39.80 |
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Calculated Relative Intensity Colors of Haycockite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
440% |
| R1 |
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| R2 |
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Calculated Properties of Haycockite
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| Electron Density: |
Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Haycockite =4.35 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0099294535
Boson Index = 0.9900705465 |
| Photoelectric: |
PEHaycockite = 26.90 barns/electron
U=PEHaycockite x rElectron Density= 110.79 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Haycockite is Not Radioactive |
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Haycockite Classification
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| Dana Class: |
02.09.08.02 (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 Haycockite Information
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| 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 - 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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Haycockite Specimen Label here :
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Haycockite
Cu4Fe5S8
Dana No: 02.09.08.02 Strunz No: 02.CB.10b
Locality:
Notes:
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