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Algodonite Mineral Data
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General Algodonite Information
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 Chemical Formula: |
Cu6As |
| Composition: |
Molecular Weight = 456.20 gm |
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Copper 83.58 % Cu |
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Arsenic 16.42 % As |
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______ |
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100.00 % |
| Empirical Formula: |
Cu6As |
| Environment: |
Hydrothermal deposits associated with other copper arsenides. |
| IMA Status: |
Valid Species (Pre-IMA) 1857 |
| Locality: |
Chile, Algodones silver mn, Coquimbo Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Algodonite + Pronunciation  |
| Synonym: |
Whitneyite |
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Algodonite Image |
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Images:
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Algodonite
Comments: Massive specimen of dark algodonite with vuggy areas filled with minute crystals.
Location: Algodones Mines, CoquÃmbo Province, Chile.
Scale: 4x3x3 cm.
© John Betts - Fine Minerals |
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Images:
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Algodonite Crystallography
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| Axial Ratios: |
a:c = 1:1.62615 |
| Cell Dimensions: |
a = 2.6, c = 4.228, Z = 0.3; V = 24.75 Den(Calc)= 9.18 |
| Crystal System: |
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc |
| X Ray Diffraction: |
By Intensity(I/Io): 1.989(1), 2.11(0.4), 2.25(0.2), |
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Physical Properties of Algodonite
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| Cleavage: |
None |
| Color: |
Gray, Silver white, Steel gray, Tarnishes dull bronze. |
| Density: |
8.38 - 8.72, Average = 8.55 |
| Diaphaneity: |
Opaque |
| Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Habit: |
Tarnishes - Freshly fractured surfaces form a surface oxidation film |
| Hardness: |
4 - Fluorite |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Nonmagnetic |
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Optical Properties of Algodonite
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| Optical Data: |
NCalc= 3.02 - from Gladstone-Dale relationship (KC = 0.2202) where Ncalc=Dcalc*KC+1
NCalc= 2.88 - from Gladstone-Dale relationship (KC = 0.2202) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Weak. |
| RL Color: |
Bright cream white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Algodonite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
54.20 |
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| 420 nm |
55.50 |
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| 440 nm |
56.80 |
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| 460 nm |
58.20 |
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| 480 nm |
59.40 |
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| 500 nm |
60.60 |
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| 520 nm |
61.80 |
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| 540 nm |
62.80 |
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| 560 nm |
63.80 |
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| 580 nm |
64.70 |
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| 600 nm |
65.50 |
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| 620 nm |
66.20 |
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| 640 nm |
66.80 |
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| 660 nm |
67.30 |
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| 680 nm |
67.70 |
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| 700 nm |
68.00 |
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Calculated Relative Intensity Colors of Algodonite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
| R |
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Calculated Properties of Algodonite
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| Electron Density: |
Bulk Density (Electron Density)=8.33 gm/cc
note: Specific Gravity of Algodonite =9.18 gm/cc.
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| Fermion Index: |
Fermion Index = 0
Boson Index = 1 |
| Photoelectric: |
PEAlgodonite = 50.32 barns/electron
U=PEAlgodonite x rElectron Density= 419.22 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Algodonite is Not Radioactive |
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Algodonite Classification
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| Dana Class: |
02.01.01.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.01)where Am Xp, with m:p>3:1 |
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(02.01.01)Dana Group |
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02.01.01.01 Algodonite Cu6As P 63/mmc 6/m 2/m 2/m |
| Strunz Class: |
02.AA.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.A - Simple Sulfides, Selenides, etc |
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02.AA -Alloys of metalloids with Cu, Ag, Sn, Au |
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02.AA.10a Algodonite Cu6As P 63/mmc 6/m 2/m 2/m |
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Other Algodonite 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 Algodonite :
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 - Scandinavian mineral gallery
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Algodonite
Cu6As
Dana No: 02.01.01.01 Strunz No: 02.AA.10a
Locality:
Notes:
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