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Delafossite Mineral Data
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General Delafossite Information
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 Chemical Formula: |
Cu+Fe+++O2 |
| Composition: |
Molecular Weight = 151.39 gm |
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Iron 36.89 % Fe 52.74 % Fe2O3 |
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Copper 41.97 % Cu 47.26 % Cu2O |
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Oxygen 21.14 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CuFe3+O2 |
| Environment: |
Principally as a secondary mineral near the base of the oxidized zone of copper deposits, less commonly a primary mineral. |
| IMA Status: |
Valid Species (Pre-IMA) 1873 |
| Locality: |
Calumet and Arizona mine, Bisbee, Cochise Co., Arizona, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Gabrial Delafosse (1796-1878), French mineralogist and crystallographer. |
| Name Pronunciation: |
Delafossite + Pronunciation  |
| Synonym: |
ICSD 60844 |
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PDF 39-246 |
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Delafossite Image |
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Images:
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Delafossite
Comments: Black crystals of delafossite on matrix.
Location: Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany.
Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag |
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Delafossite Crystallography
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| Axial Ratios: |
a:c = 1:5.63157 |
| Cell Dimensions: |
a = 3.04, c = 17.12, Z = 3; V = 137.02 Den(Calc)= 5.50 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.508(1), 1.512(0.4), 2.86(0.35), |
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Physical Properties of Delafossite
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| Cleavage: |
{1010} Indistinct |
| Color: |
Black. |
| Density: |
5.41 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Crystalline - Coarse - Occurs as well-formed coarse sized crystals. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
5.5 - Knife Blade |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Metallic |
| Magnetism: |
Magnetic after heating |
| Streak: |
black |
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Optical Properties of Delafossite
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| Dichroism (e): |
light golden brown. |
| Dichroism (w): |
rose brown. |
| Optical Data: |
Uniaxial (?). |
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NCalc= 2.52 - from Gladstone-Dale relationship (KC = 0.2767) where Ncalc=Dcalc*KC+1
NCalc= 2.5 - from Gladstone-Dale relationship (KC = 0.2767) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Strong. |
| RL Color: |
Brownish rose. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Delafossite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
18.40 |
22.20 |
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| 420 nm |
18.60 |
22.30 |
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| 440 nm |
18.80 |
22.40 |
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| 460 nm |
19.00 |
22.60 |
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| 480 nm |
19.00 |
22.90 |
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| 500 nm |
18.90 |
23.20 |
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| 520 nm |
19.00 |
23.40 |
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| 540 nm |
19.00 |
23.40 |
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| 560 nm |
19.10 |
23.20 |
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| 580 nm |
19.20 |
23.00 |
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| 600 nm |
19.30 |
23.00 |
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| 620 nm |
19.60 |
23.20 |
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| 640 nm |
20.00 |
23.50 |
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| 660 nm |
20.60 |
23.80 |
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| 680 nm |
21.10 |
24.20 |
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| 700 nm |
21.80 |
24.80 |
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Calculated Relative Intensity Colors of Delafossite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
450% |
470% |
| R1 |
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| R2 |
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Calculated Properties of Delafossite
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| Electron Density: |
Bulk Density (Electron Density)=5.16 gm/cc
note: Specific Gravity of Delafossite =5.50 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0079219338
Boson Index = 0.9920780662 |
| Photoelectric: |
PEDelafossite = 30.25 barns/electron
U=PEDelafossite x rElectron Density= 156.03 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Delafossite is Not Radioactive |
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Delafossite Classification
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| Dana Class: |
07.01.01.01 (07)Multiple Oxides |
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(07.01)where A B X2 containing copper |
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(07.01.01)Dana Group |
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07.01.01.01 Delafossite CuFeO2 R 3m 3 2/m |
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07.01.01.02 Mcconnellite CuCrO2 R 3m 3 2/m |
| Strunz Class: |
04.AB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.A - Metal:Oxygen = 2.1 and 1:1 |
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04.AB -M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only |
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04.AB.15 Delafossite CuFeO2 R 3m 3 2/m |
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04.AB.15 Mcconnellite CuCrO2 R 3m 3 2/m |
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Other Delafossite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Delafossite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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Delafossite
Cu+Fe+++O2
Dana No: 07.01.01.01 Strunz No: 04.AB.15
Locality:
Notes:
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