Mineralogy Database

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 Jug�e, 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

Brodtkorbite Image

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Comments: Polished section with partially crossed polarizers showing brodtkorbite (br) in association with tiemannite (ti) and berzelianite (bz). (CanMin, v40:225).
Location: Telethermal selenide vein-type assemblage at the Tuminico Ia selenium deposit, Sierra de Cacho (Sierra de Umango) district, La Rioja, Argentina. Scale: Picture Size 0.5 x 0.35 mm.
© Canadian Mineralogist

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 - Prismatic H-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 Diaphaneity: Diaphaneity: 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
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 330%
Calculated Relative Intensity Colors of Brodtkorbite in Oil
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 700%

Calculated Properties of Brodtkorbite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.62 gm/cc
note: Specific Gravity of Brodtkorbite =7.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEBrodtkorbite = 728.96 barns/electron
U=PEBrodtkorbite x rElectron Density=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: (02)Sulfides - Including Selenides and Tellurides
  (02.05)where Am Bn Xp, with (m+n):p=3:2
  (02.05.08)Dana Group Imiterite Ag2HgS2 P 21/c 2/m Brodtkorbite! Cu2HgSe2 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 02.BD.55 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BD -With Hg, Tl
02.BD.55 Brodtkorbite! Cu2HgSe2 P 21/n 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 02.BD.55





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