Mineralogy Database

Delafossite Mineral Data

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General Delafossite Information

Help on Chemical  Formula: Chemical Formula: Cu+Fe+++O2
Help on Composition: Composition: Molecular Weight = 151.39 gm
   Iron    36.89 %  Fe   52.74 % Fe2O3
   Copper  41.97 %  Cu   47.26 % Cu2O
   Oxygen  21.14 %  O
          ______        ______ 
          100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuFe3+O2
Help on Environment: Environment: Principally as a secondary mineral near the base of the oxidized zone of copper deposits, less commonly a primary mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1873
Help on Locality: Locality: Calumet and Arizona mine, Bisbee, Cochise Co., Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Gabrial Delafosse (1796-1878), French mineralogist and crystallographer.
Help on Name Pronunciation: Name Pronunciation: Delafossite + Pronunciation Say DELAFOSSITE
Help on Synonym: Synonym: ICSD 60844
  PDF 39-246
 

Delafossite Image

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  Delafossite

Comments: Black crystals of delafossite on matrix.
Location: Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-W├╝rttemberg, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Delafossite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:5.63157
Help on Cell Dimensions: Cell Dimensions: a = 3.04, c = 17.12, Z = 3; V = 137.02 Den(Calc)= 5.50
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.508(1), 1.512(0.4), 2.86(0.35),
 

Physical Properties of Delafossite

Help on Cleavage: Cleavage: {1010} Indistinct
Help on Color: Color: Black.
Help on Density: Density: 5.41
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Magnetic after heating
Help on Streak: Streak: black
 

Optical Properties of Delafossite

Help on Dichroism (e): Dichroism (e): light golden brown.
Help on Dichroism (w): Dichroism (w): rose brown.
Help on Optical Data: Optical Data: Uniaxial (?).
  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
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Color: RL Color: Brownish rose.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Delafossite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   18.40   22.20 
   
 420 nm   18.60   22.30 
 440 nm   18.80   22.40 
 460 nm   19.00   22.60 
 480 nm   19.00   22.90 
 500 nm   18.90   23.20 
 520 nm   19.00   23.40 
 540 nm   19.00   23.40 
 560 nm   19.10   23.20 
 580 nm   19.20   23.00 
 600 nm   19.30   23.00 
 620 nm   19.60   23.20 
 640 nm   20.00   23.50 
 660 nm   20.60   23.80 
 680 nm   21.10   24.20 
 700 nm   21.80   24.80 
Calculated Relative Intensity Colors of Delafossite in Air
Relative
Intensity
   0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 470%
R1                      
R2                      
 

Calculated Properties of Delafossite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.16 gm/cc
note: Specific Gravity of Delafossite =5.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0079219338
Boson Index = 0.9920780662
Help on Photoelectric: Photoelectric: PEDelafossite = 30.25 barns/electron
U=PEDelafossite x rElectron Density= 156.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Delafossite is Not Radioactive
 

Delafossite Classification

Help on  Dana Class: Dana Class: 07.01.01.01 (07)Multiple Oxides
  (07.01)where A B X2 containing copper
  (07.01.01)Dana Group
 
07.01.01.01 Delafossite CuFeO2 R 3m 3 2/m
 
07.01.01.02 Mcconnellite CuCrO2 R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 04.AB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.A - Metal:Oxygen = 2.1 and 1:1
  04.AB -M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only
 
04.AB.15 Delafossite CuFeO2 R 3m 3 2/m
 
04.AB.15 Mcconnellite CuCrO2 R 3m 3 2/m
 

Other Delafossite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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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Print or Cut-and-Paste your Delafossite Specimen Label here :

Delafossite

Cu+Fe+++O2
Dana No: 07.01.01.01 Strunz No: 04.AB.15
Locality:

 

Notes:

 

 
   
 


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