Brodtkorbite Mineral Data


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General Brodtkorbite Information

Help on Chemical  Formula: Chemical Formula: Cu2HgSe2
Help on Composition: Composition: Molecular Weight = 485.60 gm
   Copper    26.17 %  Cu
   Mercury   41.31 %  Hg
   Selenium  32.52 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu2HgSe2
Help on Environment: Environment: Telethermal selenide vein-type assemblage. Possibly related to Ag2HgS2 (Imiterite)
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Tuminico, Bajo Jugüe, Sierra de Cacho, Sierra de Umango, La Rioja, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Milka Kronegold de Brodtkorb (1932-), Professor at the University of Buenos Aries and La Plata, Argentina
Help on Synonym: Synonym: IMA1999-023
 

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Brodtkorbite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7936:1:1.733
Help on Cell Dimensions: Cell Dimensions: a = 7.492, b = 4.177, c = 7.239, Z = 2; beta = 114.2° V = 206.63 Den(Calc)= 7.80
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.73(1)(112), 2.223(0.7)(211), 3.991(0.7)(101),2.072(0.5)(113,312), 3.414(0.5)(200), 3.534(0.5)(011), 3.576(0.5)(110),
 

Physical Properties of Brodtkorbite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark gray.
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray
 

Optical Properties of Brodtkorbite

Help on RL Anisotrophism: RL Anisotrophism: Weak to strong.
Help on RL Bireflectance: RL Bireflectance: Strong.
Help on RL Color: RL Color: White.
Help on RL Pleochroism: RL Pleochroism: Weak to moderate.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Brodtkorbite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   29.60   37.10 
   
 546 nm   27.40   35.10 
 589 nm   26.60   34.60 
 650 nm   26.10   34.10 
Standardized Intensity (100%) Reflection Spectra of Brodtkorbite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   15.15   22.00 
   
 546 nm   13.30   20.15 
 589 nm   12.70   19.80 
 650 nm   12.30   19.25 
Calculated Relative Intensity Colors of Brodtkorbite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 330%
R1                      
R2                      
Calculated Relative Intensity Colors of Brodtkorbite in Oil
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 700%
R1                        
R2                        
 

Calculated Properties of Brodtkorbite

Help on Electron Density: Electron Density:

relectron=6.62 gm/cc
note: rBrodtkorbite =7.80 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.14946
Boson Index = 0.85054
Help on Photoelectric: Photoelectric:

PEBrodtkorbite = 728.96 barns/electron
U=PEBrodtkorbite x relectron=4,824.10 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brodtkorbite is Not Radioactive

 

Brodtkorbite Classification

Help on  Dana Class: Dana Class: 2.5.8.2 (2)Sulfides - Including Selenides and Tellurides
  (2.5)where Am Bn Xp, with (m+n):p=3:2
  (2.5.8)Dana Group
 
2.5.8.1 Imiterite Ag2HgS2 P 21/c 2/m
 
2.5.8.2 Brodtkorbite ! Cu2HgSe2 P 21/n 2/m
Help on  Strunz Class: Strunz Class: II/B.06-55 II - Sulfides and sulphosalts
  II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold
  II/B.06 - Jalpaite - Imiterite series
 
II/B.06-10 Jalpaite Ag3CuS2 I 41/amd 4/m 2/m 2/m
 
II/B.06-20 Mckinstryite (Ag,Cu)2S Pnam 2/m 2/m 2/m
 
II/B.06-30 Stromeyerite AgCuS C mcm 2/m 2/m 2/m
 
II/B.06-40 Eucairite CuAgSe Pmmn 2/m 2/m 2/m
 
II/B.06-50 Henryite Cu4Ag3Te4 Unk Cubic
 
II/B.06-55 Brodtkorbite Cu2HgSe2 P 21/n 2/m
 
II/B.06-60 Imiterite Ag2HgS2 P 21/c 2/m
 

Other Brodtkorbite Information

Help on References: References: NAME( MinRec, vol 34, p 203) PHYS. PROP.(MinRec, vol 34, p 203) OPTIC PROP.(MinRec, vol 34, p 203)
Help on See Also: See Also: Links to other databases for Brodtkorbite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Brodtkorbite

Cu2HgSe2
Dana No: 2.5.8.2 Strunz No: II/B.06-55
Locality:

 

Notes:

 

 
   
 
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